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Pneumatic Piston Shut-Off Valve

Keywords: metering pump accessories

Classification:

Pneumatic control valve

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  • DESCRIPTION

    The pneumatic piston cut-off valve consists of a pneumatic piston actuator and a linear adjustment mechanism, which are connected by a bracket in the middle. According to the type of regulating mechanism, pneumatic piston shut-off valves can be divided into three types: straight-through single-seat cut-off valve (ZSQP type), straight-through sleeve cut-off valve (ZSQM type), and two-position three-way cut-off valve (ZSQN type). There are two types of pneumatic piston actuators: single-acting (spring return) and double-acting (double air inlet). It adopts a single-acting actuator, and the action mode of the whole machine can be divided into air-closing type (the horizontal pipeline is connected) and air-opening type (the horizontal pipeline is disconnected). Pneumatic piston shut-off valves have two sealing forms: hard seal and soft seal, which are suitable for different temperatures and pressures.

    When the signal pressure is zero, the valve core is in the initial state (normally open or normally closed) due to the pretightening force of the spring (single-acting only). When the actuator receives the signal pressure (0.4~0.6MPa), thrust is generated on the piston, compressing the spring, driving the push rod, valve body, and valve core to move to the extreme position, making the valve fully open or fully closed. Achieve the control of connecting and cutting off the medium in the pipeline or switching between pipelines. Equipped with a two-position three-way solenoid valve to make the control of the piston shut-off valve more convenient and simple

    3. Main parts materials

    Main parts materials: Valve body: HT200, ZG230~450 or lining of the above materials

    Diaphragm: Butadiene rubber, natural rubber, PTFE corrugated

    Membrane: Rubber-clamp reinforced polyester fabric 

    Spring: 60S12Mn Valve body lining material and application range

     

    4. Specifications and technical parameters

    Nominal diameter DN (mm)

    20

    25

    32

    40

    50

    65

    80

    100

    Rated flow coefficient Kv

    7

    11

    20

    30

    48

    75

    120

    190

    Rated stroke(mm)

    8

    12

    20

    25

    Cylinder diameter (mm)

    75

    100

    150

    Allowable leakage

    Hard seal(1/h)

    Single seat, three-way: 1.2X10 -7 X valve rated capacity sleeve: 5X10 -6 X valve rated capacity

    Soft seal

    Level VI

    Working temperature(℃)

    -20 ~ 200 -40 ~ 450

    Nominal pressure PN (MPa)

    1.6 4.0 6.4

    Allowable pressure difference (MPa)

    ZSQP

    single acting

    1.16

    0.66

    0.38

    0.6

    0.39

    0.47

    0.31

    0.20

    double action

    6.4

    5.0

    2.8

    3.3

    2.13

    2.71

    1.75

    1.11

    ZSQM

    single acting

    Nominal pressure

    double action

    ZSQN

    single acting

    0.89

    0.57

    0.35

    0.56

    0.36

    0.45

    0.30

    0.20

    double action

    5.2

    3.22

    2.03

    2.27

    1.46

    2.00

    1.32

    0.85

    Signal pressure (kPa)

    0 or 400 ~ 600

    The actuators listed in the table are standard configurations and can be selected according to process requirements.

     

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    1. Product model and name 2. Nominal diameter DN (mm) 3. Nominal pressure 4. Flow characteristics 5. Valve body material 

    6. Rated flow coefficient 7. Medium type and temperature range 8. Pressure before and after the valve (pressure difference) 9. Control signal 10. Other special requirements