Product Overview:
ZSQ pneumatic piston shut-off valve (referred to as piston shut-off valve) is an actuation unit in the pneumatic unit combination instrument. It receives signals from the regulating instrument to control the cutting off and opening or switching of fluids in the process pipeline. The product has the advantages of large operating force, novel valve body design, small flow resistance, large rated flow coefficient, large allowable pressure difference, and excellent sealing performance. Therefore, it is widely used in the automatic control and remote control system of production processes in petroleum, chemical, metallurgy, electric power, textile and other industrial sectors.
Product features:
The pneumatic piston shut-off valve is composed of two parts: a pneumatic piston actuator and a straight stroke adjustment mechanism, and the middle is connected by a bracket. According to the type of adjustment mechanism, the pneumatic piston shut-off valve can be divided into three types: straight-through single-seat shut-off valve (ZSQP type), straight-through sleeve shut-off valve (ZSQM type), and two-position three-way shut-off valve (ZSQN type). There are two types of pneumatic piston shut-off actuators: single-acting (spring reset) and double-acting (double intake). With single-acting actuators, the whole machine can be divided into air-closed (horizontal pipeline connection) and pneumatic-open (horizontal pipeline disconnection). 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 preload force of the spring (single-acting only). When the actuator receives the signal pressure (0.4~0.6MPa), the thrust is generated on the piston, and the spring is compressed, driving the push rod, valve body, and valve core to move to the limit position, so that the valve is fully open or fully closed. It can achieve the control of the medium in the pipeline to connect, cut off or switch between pipelines. Equipped with a two-position three-way solenoid valve, the control of the piston shut-off valve is more convenient and simple.
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Nominal diameter DN (mm) |
20 |
25 |
32 |
40 |
50 |
65 |
80 |
100 |
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Rated flow factor Kv |
7 |
11 |
20 |
30 |
48 |
75 |
120 |
190 |
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Rated stroke (mm) |
8 |
12 |
20 |
25 |
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Cylinder Diameter (mm) |
75 |
100 |
150 |
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Allowable leakage |
Hard seal (l/h) |
Single-seat, tee: 1.2×10-7× valve rated capacity |
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Soft seal |
Level VI |
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Operating Temperature ( °C ) |
-20 ～ 200 -40 ～ 450 |
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Nominal pressure PN (MPa) |
1.6 4.0 6.4 |
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Allowable Differential Pressure (MPa) |
ZSQP |
Single action |
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 |
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ZSQM |
Single action |
Nominal pressure |
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Double acting |
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ZSQN |
Single action |
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 |
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Signal Pressure (kPa) |
0 or 400 ~ 600 |
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Specification weight
|
Nominal diameter DN |
L |
A |
H |
L 1 |
H 1 |
A 1 |
Weight (kg) |
Signal connector female 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 standard
Flange standard: cast iron flange GB4216-84 cast steel flange GB9113-88, JB/T79-94
Flange sealing surface type: PN16 is convex PN40 and 64 are concave and convex surfaces, and the valve body is concave
Structure length: GB12221-89
Actuator signal interface: M10×1
*Valve body flange and flange end pitch can be manufactured according to user-specified standards.
Such as: ANSI, JIS, DIN and other standards
Ordering instructions
When ordering, please provide the following information:
The name and model of the regulating valve
Nominal diameter (mm)
Nominal pressure (MPa)
Rated flow coefficient (Kv)
Pressure in front of the valve
Cutting pressure differential
Media name
Operating temperature and range
The mode of operation of the whole machine
Valve body, valve trim and packing material
Attached accessories
Other special requirements