# Valve Flow Rate Calculator

0 for Grundfos UP15-42F). The other one will be calculated q volumetric flow rate ṁ mass flow rate Select value to input. determined by flow tests, using pressure gauges or by calculation if information on pipe types and sizes, valves, meters or other appurtenances are known. If the old original ½” mains water supply was used the flow rates could drop considerably even with good pressure. The conservation of mass (continuity) tells us that the mass flow rate through a tube is a constant and equal to the product of the density, velocity, and flow area. Flow coefficient (Cv for control valve) is the capability of a valve to flow a liquid. 4 gpm - So each owner would purchase an REG with a Flow Rate close to 6. The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. Click here for a graph relating Lohms to hole diameter and flow coefficient, C v. Pump diameter cannot be zero. An online Valve Sizing Calculator by Hass Manufacturing Company. Engine calculator solving for air flow rate given displacement, speed and volumetric efficiency Engine Design Equations Formulas Calculator Air Flow Rate AJ Design. Valves for control of flow rate c. Intake & Exhaust Flow - Liquid Dynamics & other Formulas. The larger the Cv, the greater the flow in gpm. Sizing a control valve means selecting a valve with the correct size orifice to allow good control of flow rate within a required range. Valves for stopping and starting flow Such valves are slide valves, rotary valves and flex-body valves. Most differential pressure primary flow elements are designed, constructed and operated in a manner such that the flow rate is proportional to the square root of the pressure drop across the restriction. 7 m s-1 smaller than that in the simplified FSI model.
Please note: i am looking for a calculation using excel/hand calculations and not using any other CFD solver. A Cv of 1 means a valve will pass 1 gallon per minute (gpm) of 60oF water with a pressure drop (∆p) of 1 (PSI) across the valve. UV System manufacturers calculate the dose which can be expected at different flow rates in their system, and provide recommended flow rates that ensure a sufficient dose for disinfection. The manufacturer's pressure loss data shows that a 3-inch ID hose loses 57. How do I calculate control valve pressure drop if I know Cv and flow rate? Q = water flow rate in gallons per minute Cv = flow coefficient Magic Aire reps are. com Elmira Popova and Jack Howell. The pilot valve does not have any minute, fixed restriction passage like a needle valve, and is therefore clog-resistant. Some typical values for discharge coefficient are shown below. Fittings such as elbows, tees, valves and reducers represent a significant component of the pressure loss in most pipe systems. Until now, to calculate the Volume flow rate or conveyed volume of a gear pump, technicians had to look up the formulas, pick up a calculator, enter the calculation according to the formula, and recalculate it again to check as a precaution. SCFM refers to "standard cubic feet per minute" or the given flow rate of air at standard room temperature and pressure. 3 kPa) greater than the specified reseal pressure in the flow direction. The dynamic pressure can be calculated at a given point in the system by starting with a known dynamic pressure at some point, adjusting for elevation change and subtracting friction. Using the coefficients will give relatively accurate results. This is different from the speed - the.
The Kv-value is a measure of the flow rate through a valve for a given medium and pressure drop. Clarkson University. The Bernoulli equation does not account for viscous effects of the holes in tanks or friction due to flow along pipes, thus the flowrate predicted by our Bernoulli equation calculator will be larger than the actual flow. at acceptable settings. hence, reducing its bulk density; hindering the flow of product into the valve. Knowing the velocity in any part of the system will automatically give us the flow rate. Measure flow rate or gallons per minute/GPM with a 5 gallon bucket and a watch, or through pressure drop (foot of head/psi) measurements, or with a flow meter device. You should enter selected. 0 lit/sec CALCULATION OF STATIC HEAD Discharge level at open drain = 103. A valve area of less than 0. You might have volumetric flow rate Q or mass flow rate Q m, and you would consider area and velocity (and density for Q m, since Q m =ρQ) in flow rate estimation. Oil field operators can use several practical equations for calculating flow rates of natural gas through venturi gas-lift valves. This ultra calculator is special by allowing you to choose among a great variety of units (6 for diameter and 24 each for velocity and flow rate). The pilot valve does not have any minute, fixed restriction passage like a needle valve, and is therefore clog-resistant. 7, Fifth edition, October 2005. As the fluid stream approaches. Min Flow Rate Max Flow Rate Media Line size Suggested Valve Sizing Valve Size Valve CV Specific Gravity Temperature SIZE CV DP FULL OPEN DP FULL OPEN LS DP of valve AT MIN PROCESS FLOW VALVE ACCEPTABLE DP at Min Flow DP at Max Flow Inches PSI Pipe Schedule Installation requirements; VALVE ACCEPTABLE LS 2- This sizing is based on largest full. To determine the maximum flow through a regulator use either: - the seat orifice area formula, or - the nomograph. Axial Flow Valves The Axial Flow Valve consists of three major structural components and a single moving part.
As the fluid stream approaches. The minimum flow valve arranged behind a boiler feed pump, for example, maintains this rate. (Flow Co-efficient) and it has been developed by the manufacturer through flow tests. Some typical values for discharge coefficient are shown below. Units of GAS Flow Rate DigiFLO Flow Rate sensors measure True Volumetric Gas Flow Rate in units of Litters per Minute (LPM). Y-Strainer Flow Rate Vs Pressure Drop a blow-down valve on the drain port will allow clean-out without removal of the screen, and without interrupting the process. Either consequence will result in a reduction of the feed rate capacity of the valve. This calculator can be used to see what the cubic feet per minute (CFM) would be needed for an engine of a certain size (CID) and at a certain RPM. The Bernoulli equation does not account for viscous effects of the holes in tanks or friction due to flow along pipes, thus the flowrate predicted by our Bernoulli equation calculator will be larger than the actual flow. Axial Flow Valves The Axial Flow Valve consists of three major structural components and a single moving part. The size of the vane is cut or adjusted depending on the pipe size and the flow rate expected and will switch at a certain flow. Since pressure drop follows a basic square law the relationship between Cv, flow and pressure loss is. Hydraulic Formulas Theoretical Thrust (Cylinders) N= Effective area (sq. But then I read about tank valves not being able to give enough flow rate to meet the regs. Assume the full flow (wide. The characteristic curve is a function of the pump design (impeller diameter and rpm). Fluid Dynamics. This worksheet approximates the behavior of P1 and P2 (pressure upstream and pressure downstream of a control valve) at different flow rates.
8 cm² is considered to be severe aortic stenosis. Online calculator to quickly determine Water Flow Rate through a Valve. The Cement Grinding Office. This paper addresses pressure relief valves as individual components. The Kv flow coefficient of a control valve can be calculated from the flow rate and the pressure drop through the valve. Below is a table of the flow rates for Butterfly Valves at different opening stages between zero degrees (fully closed. Even though most of our echo machines will calculate it for us these days, it’s still important to know how it’s used. flow is “continuous”, and the Continuity Equation is applicable — It is a thermodynamic principle that whenever there is a phase change between a throttling. 3 • Older constant speed chillers, do not exceed 10%. Pressure Relief Valve Sizing Craig Spears November 10, 2015. Calculators A set of calculators to help steam practitioners and designers with issues such as valve sizing, pipe sizing, and start up and running losses from tanks and pipes and many more. For a new valve, this leakage rate must be lower than 0. A Cv of 1 means a valve will pass 1 gallon per minute (gpm) of 60oF water with a pressure drop (∆p) of 1 (PSI) across the valve. See pages 3, 4 & 5 for the equations for liquid, gas, steam and two phase flow. FLOW DATA Cv Values for DJ Series Butterfly Valves 0 10 20 30 40 50 60 70 80 90 100 10° 20° 30° 40° 50° 60° 70° 80° 90° Valve Opening (º) F l ow R a t e (%) * Cv is defined as the flow in GPM that a valve will carry with a pressure drop of 1. You should enter selected one.
01 specifications for control valve sizing, with calculations that include: Master Flo choke valve sizing and coefficient of valve capacity (Cv). Air Blower flow rate calculation: design with 2. The pipes will be getting water pumped into them using an electrical pump. Le Kvo of the valve: It is the leakage rate which crosses the valve if it presents a pressure loss of 1 bar (DPv =1 bar) when it is completely closed. Hydraulic Formulas Theoretical Thrust (Cylinders) N= Effective area (sq. If the pressure is known in pounds per square inch, or psi, at two locations along the pipe, then the Bernoulli equation can be used to determine the velocity of the water. In deciding the size of the control valve that (Port Size) we need to calculate the Cv value of the process (Calculated Cv) by calculating Cv has educated more than 50 years, which is involved in. q/ṁ Calculate flow rate Δp Calculate pressure drop Cv/Kv Calculate flow coefficient Select value to input. Need additional help, talk to one of our experts. Fluid Dynamics. At a certain flow rate, the pump efficiency will be a maximum, and this will be. A valve area of less than 0. Measurement of system parameters during the pilot tests utilized the following equipment: † Magnehelic vacuum gauges of varying sizes (0 to 10 in. If the liquid. Low Flow Bypass is critical to maintain minimum chilled water flow through the chillers. A flow control valve delivers a constant flow whatever the pressure drop through the valve. To select the correct valve to fulfill these functions properly, an outline of the different types of valves and their features is given below. Valve performance plays a significant role in the overall power production of an engine. The additional flow area relative to valve opening rate and duration offers increased potential for overall cylinder filling.
0 lit/sec(estimated) Design flow rate =2. 01 Cold Water Pipe Sizing) 2. For further information see our Flow Calculation - (Kv) article. The minimum flow rate describes the lowest possible flow rate to be maintained in order to prevent impermissible increases in temperature inside the pump. The discharge tunnel that flows water out into the ocean has culverts about 24. at acceptable settings. CALCULATING FLOW RATES. At this flow rate, with a 0. A strong linear relation was observed between Gorlin valve area and mean transit-time volume flow rate for each study (median, r =. Need additional help, talk to one of our experts. Automatic flow rate regulators and balancing valves. 0 psi, when the media is 60ºF water. With this very small flow rate the flow is subsonic and the pressure loss across the 100 ft long line is only 0. This head loss is included in the overall system loss calculations to determine the size of the relief system. You can calculate the flow through the fire hose with this information. Flow rate and valve sizing In order to design valves for a process system correctly, the valve size is determined by the required flow rate.
style valves. This might be useful if valve Cv calculations need to be made at several flow rates, when only P1 and P2 are known at the maximum and minimum design flow rates. Most valve manufacturers offer lookup tables that show Cv, desired flow rate, and pressure drop to make it easier to select valves without having to do a lot of complex calculations. Hass Manufacturing Company accepts no responsibility for the acceptability or fitness of use. Did you find us useful? Please consider supporting the site with a small donation. Johnson Department: Civil and Environmental Engineering Butterfly valves are versatile components widely used in hydraulic systems as shutoff and throttling valves. For more information, contact Generant today. Each valve has its own flow coefficient. Problem: Find the valve position of a 2½" rubber lined valve, with a water flow of 285 gpm and a pressure drop of 1 psi. Conversion:. To make the distinction clear, think about the flow rate of a river. 'Any % change in the opening from its current existing value changes the flow by same percentage of its current value at current opening. The only reading we take with the electronic manometer is the differential pressure (dP) – When we have taken the reading we have to equa te this to the balancing valve design figures so that we can establish the flow through the valve. The figure also shows the power requirement and pump efficiency of the pump as a function of flow rate. Measured with water at a pressure drop 1 bar over the valve. What I listed was average flow required, and you're saying due to the lobe shapes and ramp rates, that with realistic valve lift and time to lift the requirements go up because the available time that the valve is appreciably open is so short. IV Flow Rate Calculation Example. Each valve is given a value which links the dP with the flow rate. At a certain flow rate, the pump efficiency will be a maximum, and this will be. Click on a link below to see how much water and money you could be saving with Rain Bird: 1800-PRS: 5 Easy Steps to Calculate Water Savings Estimated Water Savings Using Rain Bird 5000/5000 Plus PRS Series Rotors Landscape Drip Zone Calculator Landscape Drip Point Source Emitter Calculation Tool.
SCFM refers to "standard cubic feet per minute" or the given flow rate of air at standard room temperature and pressure. Straightway Valves Problem: Find the rate of flow of water through a 1½" unlined flanged valve, half open, with a pressure drop of 1 psi. 本ソフトウエアによる機器選定・計算結果は実機を用いた場合と異なることがあります。 2. Definition Kv-value: Amount of flow (m 3 /hour) of water of 20°C in a valve with a pressure loss of 1 bar. 2Nm3/min(p=4000mmAq，Re-circulated and cooling vertical type roots blower, 50MM，3HP)＞2. The result of the square root extraction is a still percentage value, which is applied as to 4. A tortuous flow path (bottom), as with this five-port valve, will result in a lower flow rate due to greater stress on the medium as it travels through the valve. The valve's required discharge capacity must be determined through an analysis of the total system design. To determine the maximum flow through a regulator use either: - the seat orifice area formula, or - the nomograph. Mass Balance Limitations for Flow Rate Calculation Only one UnitOp on a branch of the network may calculate flow. With a simple mathematical formula, you can calculate the drip-irrigation flow rate for your entire system or a single section or zone. Pump diameter cannot be zero. After introducing a few operating conditions, quickly calculate the air consumption and / or the air flow capacity that a given cylinder, rotary actuator, air gripper or air blow solution will require. Go to online calculation of the Flow coefficient Cv and Kv. Most valve manufacturers offer lookup tables that show Cv, desired flow rate, and pressure drop to make it easier to select valves without having to do a lot of complex calculations. 01 Cold Water Pipe Sizing) 2.
Flow Calculations for Gases. coefficient corresponds numerically to the value of natural gas. The idea of a control valve is to control the flow rate by controlling pressure losses across the valve. 1) whereqis the volume flow rate of the oil, K q is the flow gain, K c is the pressureflow coefficient and p m is the pressure difference across the load. Bob Blanchard of the Ontario Sheet Metal Workers Training Centre guides you through how to measure external flow rates at circuit balancing valves. Most valve manufacturers publish Cv data in product catalogues for various valve styles. CV stands for the “coefficient of flow” of a valve, and is further defined as the flow rate in gallons of 60°F water that will pass through a valve in one minute at one-pou. Some typical values for discharge coefficient are shown below. The rounding of lateral. This means a 48 sq. Flow rate, heat output and Delta-T Hydronics have its share of non-proportional relationships. The Kv flow coefficient of a control valve can be calculated from the flow rate and the pressure drop through the valve. To demonstrate, calculate the head loss for the valves and fittings in a pipeline when 600 gpm of water is flowing through the following valves and fittings: a sharp-edged transition from a tank to pipeline, a full-seated globe valve and a strainer with a C V value of 450. air) a different formula is used (see correction factor gases below). **Asking Price $15,293. Flow switches or transmitters are available. Even though most of our echo machines will calculate it for us these days, it’s still important to know how it’s used. Sizing conventional and pilot operated relief valves for gas or vapour relief. Every valve has at least two positions and each position has one or more flow paths. If the valve has a rangeability ratio of 50:1 and is subjected to a constant differential pressure, calculate the % change in flow rate through the valve for valve lifts at 10% intervals.
Two-phase flow, during this study, consists out of water and air. 8 psi for an 850 gpm flow. Enter your application's fluid properties, hose and coupling specifications, and our Fluid Flow Pressure Calculator will help identify your operational issues, so you can eliminate costly downtime, improve efficiency, and save money. Flow Calculator. The ASCO flow calculator is a helpful tool. (1)FlowCoefficientCvvalue,Kvvalue for valves expresses flow rate in liter per minute of 60℉ Pressure drop across the valve body required to produce choked. flow is "continuous", and the Continuity Equation is applicable — It is a thermodynamic principle that whenever there is a phase change between a throttling. The CV factor is a standard used by all valve manufacturers. q/ṁ Calculate flow rate Δp Calculate pressure drop Cv/Kv Calculate flow coefficient Select value to input. 5 Lpm) is not recommended until thermostatic mixing valve requirements are flow rate-matched to accommodate lower flows. Flow rate, heat output and Delta-T Hydronics have its share of non-proportional relationships. This uncontrollable flow rate can be approximated as shown in the following example. 2 Calculate BASE flow rate 3 Add for Continuous Boiler Blowdown flow 4 Add for by-pass flow if required 5 Sum of base flow, by-pass flow, and Blowdown flow is the total flow required 6 Calculate BASE pumping head 7 Add for all suction piping head components 8 Add for all discharge piping system head components (including feed valve if required). The flow is said to be at its minimum controllable flow. Flow rates based on valve size, Cv and pressures. Some quick numbers from the Radiant Panel "RadPad" calculator. Leakage rate The leakage rate of a valve is the ratio Kvo / Kvs. Head Loss Calculator developed by Jason Nugent, with pump curve information courtesy of Shane Graber and Reefs. Griffco corporation stops are designed to ensure that chemical feed systems inject into the center of a process stream for better mixing and to prevent corrosion along the process pipe. Engine calculator solving for air flow rate given displacement, speed and volumetric efficiency Engine Design Equations Formulas Calculator Air Flow Rate AJ Design.
Pressure gradient and flow tracings are displayed with a linear fit (regression line) for the flow decay and the parabolic eit (curved Kne) (see text for details) for pressure decay. The amount of flow of a fluid through a (solenoid) valve can easily be calculated with flow coefficient Kv. the flow rate is exactly proportional to ∆p. Valve Flow Coefficient (Cv) is a valve’s capacity for a liquid or gas to flow through it. Rate of change of flow • Do not exceed rate of change greater than 30% of design flow per minute. Go to online calculation of the Flow coefficient Cv and Kv. It is important to confirm you are using the correct FL value, as it directly impacts the calculated CV. Even though we work on a metric system, measures of flow are commonly given as a CV value which is an; Imperial measure flow in US gallons per minute of water at 60° fahrenheit with pressure drop of 1 psi across the valve. Automatic flow rate regulator with high resistance polymer cartridge and ball valve Accessories for. The flow set by UnitOp setting indicates that the flow rate is controlled by the adjacent UnitOp. Pipe Fittings Loss Calculations with K Factors Pipe fittings, valves and bends usually have some associated K factor or local loss coefficient, which allows the calculation of the pressure loss through the fitting for a particular fluid flowing at a specified velocity. Flow Measurement These devices sense the flow rate. This principle is illustrated below along with a sample calculation at the bottom of the page. The minimum flow rate to protect the container is 12% of the container's internal volume per minute; The minimum flow rate shall be determined at a differential pressure of 1. In performing the valving function, the restrictive ports control the flow rate so that the excess pressures become centralized in one place - at the ports of the valve.
Automatic flow rate regulators and balancing valves. hence, reducing its bulk density; hindering the flow of product into the valve. I work in the Oilfield doing Flowback. Operation of Minimum Flow Valve (ARV) Minimum Flow or Automatic Recirculation Valves automatically protect centrifugal pumps during low load operation. CALCULATION TOOLS Flow Coefficient KV Flow Coefficient KV The data and information contained in this guide do not constitute a stated or implied guarantee Volumetric flow rate: l/minl/hm3/hgpm (Galloni al minuto) Differential pressure: barpsiKg/cm2 Gf: Specific gravity of test liquid compared to water at 15°C Results: Kv 100 (l/min) Kv (m3/h) Cv (gpm) Calculate Clear. The principle behind the calculation is. 5 7 15 20 30 36 45 52 67 433 0. flow rate q through a valve is q K x K p q c m (1. The larger this value, the higher the flow rate through the valve will be at a given pressure drop. Garden Hose Flow Rate and Time. Hass Manufacturing Company accepts no responsibility for the acceptability or fitness of use. Max Flow Rate. Vane Flow Switch A vane flow switch may be installed in the pipe to prove flow. Typically these would need to have a larger mains water supply coming in to the house and would give good flow rates all round in excess of 15 to 25 l/m. To select the correct valve to fulfill these functions properly, an outline of the different types of valves and their features is given below. This is normally expressed as mL/Hr or mL/min. Need additional help, talk to one of our experts.
where q is the flow rate, SG is the specific gravity of the fluid, and dp is the pressure drop across the valve. FLOW COEFFICIENTS Cv VALUES The valve flow coefficient (Cv) is a number which represents a valve's ability to pass flow. Two-phase flow, during this study, consists out of water and air. Aortic valve area calculation is an indirect method of determining the area of the aortic valve (aortic valve area or AVA). Cal-Val 49-01 and 649-01 Rate of Flow and Pressure Reducing Valves automatically reduce a higher inlet pressure to a steady lower downstream pressure regardless of changing flow rate and/or varying inlet pressure, as long as the flow rate is below a preset maximum. In performing the valving function, the restrictive ports control the flow rate so that the excess pressures become centralized in one place - at the ports of the valve. Variable conditions are the flow rate, the closing of the valve and the void fraction. This will calculate your maximum flow rate or flow capacity. The new shower flow rates presented a challenge: how to create the best showering experience possible despite the restrictions and limitations of individual homes. Even though most of our echo machines will calculate it for us these days, it’s still important to know how it’s used. In order to properly size a check valve, you must have viscosity of material, media, pressure, temperature and flow rate (defined as: the number of US gallons of water per minute at 60°F that will flow through the valve with a pressure drop of 1 psi) to be able to customize a centre-guided check valve to the application - this involves changing the distance the. Connected to the bottom of the culvert is a 48" pipe that goes to a gate valve of the same diameter. Example: Throttling Service Given: Q - 975 GPM (Flow) DP. Cv by definition is the number of gallons per minute (GPM) a valve will flow with a 1 psi pressure drop across the valve. globe valve where Cv equals 350 and rangeability equals 10. It is important to confirm you are using the correct FL value, as it directly impacts the calculated CV. Therefore, the main differences between different flow coefficients come from the type of valve, and of course the opening position of the valve. This calculator can be used to see what the cubic feet per minute (CFM) would be needed for an engine of a certain size (CID) and at a certain RPM. For the same area, at certain condition, the flow capacity of relief valve orifice must be less compared with the ideal one - Its mean that more area is required to handle the same mass relieving rate -. Valve Flow Coefficient (Cv) is a valve's capacity for a liquid or gas to flow through it.
Some typical values for discharge coefficient are shown below. Resistance to Flow Method (K R) — The K R represents the velocity head loss due to the rupture disc device. The CV factor is a standard used by all valve manufacturers. The use of the flow coefficient offers a standard method of comparing valve capacities and sizing valves for specific applications that is widely accepted by industry. valve's application or operation is necessary for the successful operation of a facility. Basically, the larger the opening in a valve, the larger the Cv. Good pressure doesn’t necessarily mean good flow. The Proximal Isovelocity Surface Area or PISA method or calculation of MR assumes that there is flow convergence in systole around one leaking orifice of the mitral valve. Mass Balance Limitations for Flow Rate Calculation Only one UnitOp on a branch of the network may calculate flow. A competent calculation to determine your optimum flow rate would include your water loop length and fitting pressure drop calculation vs. By using two larger diameter orifices. 5 15 40 55 82 101 125 146 190 1432 0. To determine the maximum flow through a regulator use either: - the seat orifice area formula, or - the nomograph. F SPEC GRAV AC Controls Valve Sizing STEAM. The size of the vane is cut or adjusted depending on the pipe size and the flow rate expected and will switch at a certain flow. High pressure cylinder oxygen is regulated to 50 psi (345 kPa) before passing through the flow control valve and barbed outlet fitting. Go to online calculation of the Flow coefficient Cv and Kv.
5 Lpm) is not recommended until thermostatic mixing valve requirements are flow rate-matched to accommodate lower flows. How to Calculate Valve Size. pressure data for the fire hose. filters are normally rated at 2 GPM per square feet (sq. For further information see our Flow Calculation - (Kv) article. Min Flow Rate Max Flow Rate Media Line size Suggested Valve Sizing Valve Size Valve CV Specific Gravity Temperature SIZE CV DP FULL OPEN DP FULL OPEN LS DP of valve AT MIN PROCESS FLOW VALVE ACCEPTABLE DP at Min Flow DP at Max Flow Inches PSI Pipe Schedule Installation requirements; VALVE ACCEPTABLE LS 2- This sizing is based on largest full. to keep a constant direction of flow, and 3. Formulas for Calculating Flow Rate From a Vessel. The above equations calculate the steady state mass flow rate for the pressure and temperature existing in the upstream pressure source. Straightway Valves Problem: Find the rate of flow of water through a 1½" unlined flanged valve, half open, with a pressure drop of 1 psi. The pilot valve does not have any minute, fixed restriction passage like a needle valve, and is therefore clog-resistant. The ASCO flow calculator is a helpful tool. Valves for fluids with solids in suspension The valves best suited for this duty have a closure member which slides across a. Tee Flow Branch: Plug Valve Flow Rate(gpm): Gate Valve: Globe Valve: Ball Valve Viscosity (cP): Typical Values: 3 Way Plug Valve: Swing Check Valve: Lift Check Valve Specific Gravity (water=1): Typical Values: Butterfly Valve 2"-8" Butterfly Valve 10"-14" Butterfly Valve >14" Temperature (F): Pipe Entrance: Pipe Exit Piping Length (ft): Angle. 8 psi for an 850 gpm flow. All control valves are selected from the flow you want to have through the valve, not the nominal size. Valve Flow Rate Calculator.