Pneumatic Piston Actuated Quick Shut-Off Valve
Pneumatic Piston Actuated Quick Shut-Off Valve
Pneumatic Piston Actuated Quick Shut-Off Valve
Pneumatic Piston Actuated Quick Shut-Off Valve

Pneumatic Piston Actuated Quick Shut-Off Valve

  • High output force, large Kv, low flow resistance and high allowable differential pressure
  • Single-seat, cage or 2-position 3-way types; single-acting (spring return) or double-acting; handwheel option
  • Hard or soft seat; DN20-100, PN1.6-6.4 MPa, -20 °C to +450 °C; signal 0 or 400-600 kPa

Category

Overview

ZSQP pneumatic piston actuated quick shut-off valve is the final control element of pneumatic unit-combination instrument systems. It receives signals from the control instrument to open, shut off or divert the flow of process medium in the pipeline. The valve offers high output force, a novel body design, low flow resistance, large rated flow coefficient, high allowable differential pressure and excellent sealing performance, and is therefore widely used in automatic and remote control systems in the petroleum, chemical, metallurgical, power, textile and light industries.

An optional manual override (handwheel) mechanism is available, allowing the valve to be operated manually when the air supply is unavailable or during commissioning.

Features

  • Consists of a pneumatic piston actuator and a linear-motion control valve connected by a yoke.
  • Available in three body types: straight-through single-seat shut-off valve (ZSQP), straight-through cage shut-off valve (ZSQM) and 2-position 3-way shut-off valve (ZSQN).
  • Single-acting (spring return) or double-acting (double air supply) piston actuator; air-to-close type (valve open, pipeline connected, on air failure) or air-to-open type (valve closed, pipeline shut off, on air failure).
  • Hard-seat or soft-seat design for different temperature and pressure requirements.
  • Operating principle: when the signal pressure is zero, the plug is held in its initial position (normally open or normally closed) by the spring preload (single-acting only). When the actuator receives a signal pressure of 0.4-0.6 MPa, the piston generates thrust, compresses the spring and drives the push rod and plug to the limit position, fully opening or fully closing the valve to connect, shut off or divert the medium. A 2-position 3-way solenoid valve can be fitted for convenient and simple control.

Main Parts Materials

Component Material
Valve Body HT200, ZG230-450, or lined with the above materials
Diaphragm NBR, natural rubber or PTFE bellows
Actuator Diaphragm NBR reinforced with polyester fabric
Spring 60Si2Mn

Specifications & 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 Bore Diameter (mm) 75 100 150
Allowable Leakage Hard Seat (L/h) Single-seat and 3-way: 1.2 × 10-7 × rated valve capacity; Cage: 5 × 10-6 × rated valve capacity
Soft Seat Class VI
Working Temperature (°C) -20 ~ 200, -40 ~ 450
Nominal Pressure PN (MPa) 1.6, 4.0, 6.4
Allowable Differential Pressure (MPa) ZSQP Single-acting 1.16 0.66 0.38 0.6 0.39 0.47 0.31 0.20
Double-acting 6.4 5.0 2.8 3.3 2.13 2.71 1.75 1.11
ZSQM Single-acting Nominal pressure
Double-acting
ZSQN Single-acting 0.89 0.57 0.35 0.56 0.36 0.45 0.30 0.20
Double-acting 5.2 3.22 2.03 2.27 1.46 2.00 1.32 0.85
Signal Pressure (kPa) 0 or 400 ~ 600

Note: The actuators listed in the table are standard configurations; optional selections can be made according to process requirements.

Overall Dimensions & Weight

Nominal Diameter DN L A H L1 H1 A1 Weight (kg) Signal Connection Thread
20 150 130 220 80 115 100 10 M10×1
25 160 130 220 80 120 100 12
32 180 150 235 80 130 100 15
40 200 150 235 95 138 120 18
50 230 150 240 95 155 120 25
65 290 280 250 105 178 160 30
80 310 280 260 105 207 160 40
100 350 280 265 105 222 160 60

Connection Dimensions & Standards

Item Description
Flange Standard Cast iron flanges: GB4216-84; cast steel flanges: GB9113-88, JB/T79-94
Flange Face Type PN16: raised face; PN40/64: male-and-female face, with the valve body being the female face
Face-to-Face Dimension GB12221-89
Actuator Signal Connection M10×1
Note Valve body flanges and face-to-face dimensions can be manufactured to customer-specified standards, such as ANSI, JIS and DIN

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