Pneumatic Piston Cut-off Valve

Fast-acting and reliable shutoff valve utilizing a pneumatic piston actuator, designed for critical safety and process isolation applications.

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Product Overview

WUYI's pneumatic piston shut-off valves serve as the actuator unit in control instrumentation systems. They receive signals from control instruments to cut off or open fluid flow in process pipelines. These valves feature innovative design, low flow resistance, high flow coefficient, large allowable pressure differential, and excellent sealing performance. They are widely used in automatic and remote control systems across industries such as petroleum, chemical, metallurgy, electric power, and textiles.

Technical Parameters

(DN/mm) NPS(in)	20 3/4	25 1	32 1-1/4	40 1-1/2	50 2	65 2-1/2	80 3	100 4	125 5	150 6	200 8
(DN/mm) NPS(in)	Nominal pressure (MPa)
PN1.6, 2.5, 4.0, 6.4MPa
Rated flow coefficient(KV)	Single Seat	7	11	20	33	50	80	120	200	330	480	760
	Sleeve	8	11	20	33	50	80	120	200	330	480	760
	Tee	8	12	17	29	43	70	110	165	275	440	690
Rated travel(mm)				8	12		20		25		40	60
Effective piston area (cm²)				150	175		305		700		1245
Allowable Leakage	Hard Seal	General:10 x valve rated capacity; seal type:single seat: 1.2X10⁻⁶
Allowable Leakage	Soft Seal	VI
Permissible differential pressure (MPa)	Positive effect	<Nominal pressure
Permissible differential pressure (MPa)	Counter action	<Nominal pressure
Signal pressure (KPa)		0 or 400-600
Valve cover form		The standard type (-17~+250℃),high temperature(+250~+450℃)and low temperature (-40~-196℃),bellows sealtype(-40~+350℃)
Gland Type		Bolt pressing type
Sealing packing		V type PTFE packing, impregnated PTFE packing, asbestos braided packing, flexible graph
Plug form		Single seat cone valve, sleeve double seat valve core and three-way structure
Flow characteristics		Quick opening characteristic
Optional Accessories		Hand-wheel mechanism, limit switch, solenoid valve, valve position transmitter, pneumatic acceleratorlock up valve, other

Pneumatic Piston Cut-off Valve

Product Overview

Key Features

Technical Parameters

Structure Types

Straight Through Structure

Three-way Structure

Flow Characteristic Curve