piston cut-off valve (referred to as the piston cut-off valve), is the
implementation of pneumatic actuator unit in the instrument cluster. It
receives signals from regulating instruments to control the shut-off of
fluid in the process piping and to switch the flow path on or off. The
product has the advantages of large operating force, novel design of the
valve body, small flow resistance, large rated flow coefficient, large
allowable pressure difference and excellent sealing performance. Thus
widely used in petroleum, chemical, metallurgy, electric power, textile
and other industrial sectors of the automatic control and remote control
valve adopts multi-spring actuator and adjusting mechanism to connect
with three columns, the whole height can be reduced by about 30% and the
weight can be reduced by about 30%.
2, the valve body designed by the principle of fluid mechanics such as cross-section low flow resistance flow channel, the rated flow coefficient increased by 30%.
3, the valve part of the seal has two types of tight and soft seal, close-type surfacing carbide, soft seal for the soft material production, sealing performance when closed.
4, balanced type trim, improve the allowable pressure drop off valve.
5, the bellows sealed type of valve stem to form a complete seal, blocking the possibility of media leakage.
6, piston-type actuator, operating force, the use of large pressure.
piston cut-off valve by the pneumatic piston-type actuator and the
straight stroke adjustment mechanism of two parts, the middle by the
bracket connection. According to the type of adjusting mechanism,
pneumatic piston-type cut-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
shutoff valve (ZSQN type) Pneumatic piston actuator has a single role
(spring reset) and double-acting (double intake) two. Single-acting
actuator, the role of the whole machine can be divided into gas-off
(horizontal pipe connected) and open air (horizontal pipe
disconnected). Pneumatic piston cut-off valve has a hard seal and soft
seal two seal forms, respectively, for different temperature and
When the signal pressure is zero, the spool is in its initial state (normally open or normally closed) due to the preload of the spring (only for single action). When the actuator receives the signal pressure (0.4 ~ 0.6MPa), the piston produces thrust, compress the spring, push the push rod, the valve body, the spool moves to the extreme position, the valve fully open or fully closed. To achieve the media inside the pipeline, cut off or switch between the control of the pipeline. Equipped with two three-way solenoid valve, the piston-type shut-off valve control more convenient and simple.
Nominal diameter DN (mm)
Rated flow coefficient Kv
Rated travel (mm)
Cylinder diameter (mm)
Hard seal (1 / h)
Single-seat, three-way: 1.2X10 -7 X valve rated capacity
Sleeve: 5X10-6 X valve rated capacity
Working temperature (℃)
-20 ~ 200 -40 ~ 450
Nominal pressure PN (MPa)
1.6 4.0 6.4
Allow pressure drop
Signal pressure (kPa)
0 or 400 ~ 60
1) The performance indicators of this product are in accordance with GB / T4213-92;
2) If the allowable pressure difference in the table is greater than the nominal pressure, the nominal pressure shall be taken as the nominal pressure and less than or equal to the nominal pressure;
3) Value, can be equipped with different cylinders to increase the allowable pressure.
Nominal diameter DN
Signal connector internal thread
· Flange standard: Cast iron flange GB4216-84 Cast steel flange GB9113-88, JB / T79-94
· Flange sealing surface type: PN16 convex PN40, 64 concave surface, the body is concave
· Structure length: GB12221 -89
· Actuator signal interface: M10X1
* Body flange and flange end distance can be manufactured according to user-specified standards.
Such as: ANSI, JIS, DIN and other standards
◆ Ordering Information
When ordering, please provide the following information:
· regulating valve name, model
· nominal diameter (mm)
· Nominal pressure (MPa)
· Rated flow coefficient (Kv)
· inlet pressure
· Cut off the pressure
· Name of the medium
· Working temperature and range
· The whole mode
of action · Valve body, valve trim and packing material
· With accessories
· Other special requirements