instructions

Pneumatic piston type cut-off valve (referred to as piston type cut-off valve) is the execution unit in the pneumatic unit combination instrument. It receives signals from regulating instruments to control the cutting and connection or switching of fluid flow channels in the process pipeline. This product has the advantages of high operating force, innovative valve body design, low flow resistance, high rated flow coefficient, large allowable pressure difference, and excellent sealing performance. Therefore, it is widely used in automatic and remote control systems for production processes in industrial sectors such as petroleum, chemical, metallurgical, power, and textile.

Product Features

The pneumatic piston type cut-off valve consists of two parts: a pneumatic piston type actuator and a straight stroke adjustment mechanism, connected by a bracket in the middle. According to the type of regulating mechanism, pneumatic piston type cut-off valves can be divided into three types: straight through single seat cut-off valves (ZSQP type), straight through sleeve cut-off valves (ZSQM type), and two position three-way cut-off valves (ZSQN type). There are two types of pneumatic piston actuators: single acting (spring reset) and double acting (double intake). Adopting a single acting actuator, the overall operation mode of the machine can be divided into air closed (horizontal pipeline connection) and air 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 its initial state (normally open or normally closed) due to the preload force of the spring (single acting only). When the actuator receives a signal pressure (0.4-0.6MPa), thrust is generated on the piston, compressing the spring and driving the push rod, valve body, and valve core to move to the limit position, causing the valve to fully open or close. To achieve control over the connection, disconnection, or switching between pipelines for the medium inside the pipeline. Equipped with a two position three-way solenoid valve, the piston type cut-off valve control is more convenient and simple.

Connection standards

·Flange standard: Cast iron flange GB4216-84 Cast steel flange GB9113-88 JB/T79—94
·Flange sealing surface type: PN16 is convex PN40, 64 is concave convex, and the valve body is concave
·Structural length: GB12221-89
·Execution mechanism signal interface: M10X1
*The valve body flange and flange end face distance can be manufactured according to the standards specified by the user.
For example, ANSI, JIS, DIN and other standards

Ordering Instructions

Please provide the following information when placing an order:
·Name and model of regulating valve
·Nominal diameter (mm)
·Nominal pressure (MPa)
·Rated flow coefficient (Kv)
·Pre valve pressure
·Cut off pressure difference
·Media name
·Working temperature and range
·Operation mode of the whole machine
·Valve body, valve internals, and packing materials
·Attached attachments
·Other special requirements