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Control Valve Pressure Related Chart

The control valves regulate the flow of water through pipes by opening and closing in response to changes in pressure. The valves also allow for adjustments to the amount of water flowing through the pipe.
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    A control valve has two main parts: an actuator and a valve. The actuator controls the movement of the valve stem, while the pilot valve senses the pressure inside the pipe and opens and closes the valve accordingly.

    focused one valve series rather than a variety valves
    pressure control valves manufacturer in china thinktank
    pressure control valves supplier in china thinktank

    In order to maintain constant pressure throughout the entire piping system, a control valve should be installed on each processing system.

    The control valves regulate the flow of water through pipes by opening and closing in response to changes in pressure. The valves also allow for adjustments to the amount of water flowing through the pipe.

    Control Valve Pressure-Temperature Chart

    Pressure control valves are used in a wide range of applications where accurate control of fluid pressures is required. They are often used in situations where a constant flow rate, pressure, or temperature is desired. In these cases, the flow rate can be controlled by a valve with constant opening size. This type of valve is commonly known as a “pressure control valve”. Different temperatures bear different pressure ratings for control valves, the following chart is the pressure-temperature relationship of control valves.

    Control Valve Pressure-Temperature Chart for Standard Class ASTM A216 Grade WCC Cast Steel In Accordance with ASME B16.34-2013

    TemperatureClass 150 Class 300 Class 600 Class 900 Class 1500
    °CBar
    -29 to 3819.851.7103.4155.1258.6
    5019.551.7103.4155.1258.6
    10017.751.5103.0154.6257.6
    15015.850.2100.3150.5250.8
    20013.848.697.2145.8243.2
    25012.146.392.7139.0231.8
    3259.341.482.6124.0206.6
    3508.440.080.0120.1200.1
    3757.437.875.7113.5189.2
    4006.534.769.4104.2173.6
    4255.528.857.586.3143.8
    °Fpsig
    -20 to 1002907501,5002,2503,750
    2002607501,5002,2503,750
    3002307301,4552,1853,640
    4002007051,4052,1103,520
    5001706651,3301,9953,325
    6001406051,2101,8153,025
    6501255901,1751,7652,940
    7001105551,1101,6652,775
    750955051,0151,5202,535
    800804108251,2352,055

    Control Valve Pressure-Temperature Chart for Standard Class ASTM A217 Grade WC9 Cast Steel In Accordance with ASME B16.34-2013

    TemperatureClass 150 Class 300 Class 600 Class 900 Class 1500
    °CBar
    -29 to 3819.851.7103.4155.1258.6
    5019.551.7103.4155.1258.6
    10017.751.5103.0154.6257.6
    15015.850.3100.3150.6250.8
    20013.848.697.2145.8243.4
    25012.146.392.7139.0321.8
    30010.242.985.7128.6214.4
    3259.341.482.6124.0206.6
    3508.440.380.4120.7201.1
    3757.438.977.6116.5194.1
    4006.536.573.3109.8183.1
    4255.535.270.0105.1175.1
    4504.633.767.7101.4169.0
    4753.731.763.495.1158.2
    5002.828.256.584.7140.9
    5381.418.436.955.392.2
    °Fpsig
    -20 to 1002907501,5002,2503,750
    2002607501,5002,2503,750
    3002307301,4552,1853,640
    4002007051,4102,1153,530
    5001706651,3301,9953,325
    6001406051,2101,8153,025
    6501255901,1751,7652,940
    7001105701,1351,7052,840
    750955301,0651,5952,660
    800805101,0151,5252,540
    850654859751,4602,435
    900504509001,3502,245
    950353857551,1601,930
    1000202655358001,335
    105020(1)175350525875
    110020(1)110220330550
    Flanged end ratings terminate at 538°C (1000°F)

    Control Valve Pressure-Temperature Chart for Standard Class ASTM A351 Grade CF3 Cast Steel In Accordance with ASME B16.34-2013

    TemperatureClass 150 Class 300 Class 600 Class 900 Class 1500
    °CBar
    -29 to 3819.049.699.3148.9248.2
    5018.347.895.6143.5239.1
    10015.740.981.7122.6204.3
    15014.237.074.0111.0185.0
    20013.234.569.0103.4172.4
    25012.132.565.097.5162.4
    3259.330.260.490.7151.1
    3508.429.659.388.9148.1
    3757.429.058.187.1145.2
    4006.528.456.985.3142.2
    4255.528.056.084.0140.0
    °Fpsig
    -20 to 1002757201,4402,1603,600
    2002306001,2001,8003,000
    3002055401,0751,6152,690
    4001904959951,4902,485
    5001704659301,3952,330
    6001404408851,3252,210
    6501254308651,2952,160
    7001104208451,2652,110
    750954158251,2402,065
    800804058101,2152,030

    Control Valve Pressure-Temperature Chart for Standard Class ASTM A351 Grades CF8M and CG8M(1) Cast Steel In Accordance with ASME B16.34-2013

    TemperatureClass 150Class 300Class 600Class 900Class 1500
    °CBar
    -29 to 3819.049.699.3148.9248.2
    5018.448.196.2144.3240.6
    10016.242.284.4126.6211.0
    15014.838.577.0115.5192.5
    20013.735.771.3107.0178.3
    25012.133.466.8100.1166.9
    30010.231.663.294.9158.1
    3259.330.961.892.7154.4
    3508.430.360.791.0151.6
    3757.429.959.889.6149.4
    4006.529.458.988.3147.2
    4255.529.158.387.4145.7
    4504.628.857.786.5144.2
    4753.728.757.386.0143.4
    5002.828.256.584.7140.9
    5381.425.250.075.2125.5
    5501.4(2)25.049.874.8124.9
    5751.4(2)24.047.971.8119.7
    6001.4(2)19.939.859.799.5
    6251.4(2)15.831.647.479.1
    6501.4(2)12.725.338.063.3
    6751.4(2)10.320.631.051.6
    7001.4(2)8.416.825.141.9
    7251.4(2)7.014.021.034.9
    7501.4(2)5.911.717.629.3
    7751.4(2)4.69.013.722.8
    8001.2(2)3.57.010.517.4
    8161.0(2)2.85.98.614.1
    TemperatureClass 150Class 300Class 600Class 900Class 1500
    °CBar
    -20 to 1002757201,4402,1603,600
    2002356201,2401,8603,095
    3002155601,1201,6802,795
    4001955151,0251,5402,570
    5001704809551,4352,390
    6001404509001,3552,255
    6501254408851,3252,210
    7001104358701,3052,170
    750954258551,2802,135
    800804208451,2652,110
    850654208351,2552,090
    900504158301,2452,075
    950353857751,1601,930
    1000203657251,0901,820
    1050203607201,0801,800
    110020(2)3056109151,525
    115020(2)2354757101,185
    120020(2)185370555925
    125020(2)145295440735
    130020(2)115235350585
    135020(2)95190290480
    140020(2)75150225380
    145020(2)60115175290
    150015(2)4085125205
    1. CG8M is limited to 538°C   (1000°F).
    2. Flanged end ratings terminate at 538°C (1000°F) for CF8M.

    Pressure Control Valve Characteristic

    flow characteristics of control valve pressure
    flow characteristics of control valve pressure

    The flow characteristic of the control valve is the relationship between valve travel from 0% to 100% corresponding to the flow Cv/Kv value.

    1. EQ% Characteristic (Equal Percentage Characteristic)

    The ratio of the change in flow rate to the change in valve opening position is proportional to the flow rate before the change and is expressed by the following equation.

    dCv/dL = KCv,

    so Cv = eK(L-1)

    2. Linear % Characteristic (Linear Characteristic)

    With the linear characteristic, the valve opening position and the flow rate are proportional to each other.

    Cv = KL

    L is the valve opening position, and K is a constant.

    3. Quick Opening Characteristic

    The quick opening characteristic is a kind of on-off flow characteristic, an efficient characteristic that can be used to switch the flow rate between maximum and minimum.

    control valve characteristic
    control valve characteristic

    The inherent flow characteristic of the control valve is the relationship between the flow and travel of the valve to a constant pressure drop across the valve.

    What is valve gain?

    The valve gain is the increased flow rate generated by an increasing change in plug position. This gain is a function of valve size and type, plug configuration, and system operating conditions. The gain at any point in the valve travel is equal to the slope of the valve flow characteristic curve at that point.

    What are the Cv value and Kv value for the control valve?

    The valve coefficient Cv is the number of US gallons per minute of water at 60 °F that will flow through a valve at a specific opening with a 1 psi pressure drop across the control valve. The flow factor Kv Flowrate in m³/h of water at between 25 °C will create a pressure drop of one bar across the control valve. 

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    With expertise in valves and rich experience in the oil&gas, chemical industry, textile mills, power plants, and sugar mills. THINKTANK has become the premier manufacturer of next-generation precision control valves.

    With a customer base that includes over 42 of the world’s leading engineering&contractors and international valve brands, THINKTANK Valves offers cost-effective valves that help our customers achieve automated process control without paying high prices.

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