Pneumatic Diaphragm Cut-Off Valve

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Pneumatic Diaphragm Cut-Off Valve

Gland Form: Bolt pressing type
Plug Form: Single seat valve
Size: 3/4″~8″
Nominal Pressure: PN1.6, 2.5, 4.0, 6.4MPa
Sealing Packing: V type PTFE packing
Using Medium: Steam, water, oil, gas
Temperature Control Range: 0 ~ 250°C

Product Overview

The pneumatic diaphragm cut-off valve is subject to a top guide structure with multi spring diaphragm actuator. There are three types of valve body structure: single seat, sleeve, and three-way. It has the advantages of compact structure, light weight, sensitive action, S streamlined fluid passage, small pressure drop loss, large valve capacity, convenient disassembly and assembly, etc. The valve receives the signal from the regulating instrument, cuts off, opens or changes the flow direction of the fluid to achieve the automatic control of the process parameters such as pressure, flow, temperature, or liquid level. It is widely used in the automatic control and remote control system of production processes of environmental protection, water treatment, petroleum, chemical industry, metallurgy, electric power, light industry, textile, and other industrial sectors.

Model Preparation

Z	Actuator
Z series shut-off valve	H: Pneumatic piston actuator J: Pneumatic film actuator R: Electric 3410L actuator D: Electric PSL actuator
H	Structural Style
Q Shut-off valve	P: Standard single seat shut-off valve PF: Soft seal single seat shut-off valve PG: Single seat shut-off valve with heat dissipation PV: Bellows type single seat shut-off valve PD: Low temperature single seat shut-off valve M: Standard type sleeve cut-off valve MF: Soft seal sleeve cut-off valve MG: Sleeve shut-off valve with heat dissipation MV: Bellows type sleeve cut-off valve MD: Low temperature sleeve shut-off valve

Product Features

The overall height of the valve can be reduced by about 30%; and the weight can be reduced by about 30%.
The valve body is designed as a low flow resistance passage with constant cross section according to the fluid mechanics principle; and its rated flow coefficient increases by 30%.
There are soft and hard two kinds of sealing forms. PTFE or PPPs are used for soft sealing. Hard sealing is overlaid with hard alloy. The sealing performance is better.
Balanced valve trim improves the allowable pressure difference of cut-off valve.

Specification Parameters

Part material

Body	ZG230~450, ZG1Cr18Ni9Ti, ZGCr18Ni12Mo2Ti
Plug	1Cr18Ni9Ti, Cr18Ni12Mo2Ti
Seat	1Cr18Ni9Ti, Cr18Ni12Mo2Ti
Stem	1Cr18Ni9Ti, Cr18Ni12Mo2Ti
Actuator Material	A3, 1Cr18Ni9Ti
Packing	PTFE, Flexible graphite
Diaphragm	Nitrile rubber, Oil-resistant rubber, Fluorine rubber

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″
Nominal Pressure (MPa)		PN1.6, 2.5, 4.0, 6.4
Rated flow coeffcient	Single Seat (Kv)	7	11	20	30	48	75	120	190	300	480	760
	Sleeve (Kv)	8	11	20	30	48	75	120	190	300	480	760
	Tee (Kv)	8	12	17	29	43	70	110	165	275	440	690
Rated Travel (mm)		8			12		20		25	40		60
Effective Piston Area (cm²)		100			200		400			600		1000
Allowable Leakage	Hard Seal	General: 10⁻⁴ valve rated capacity; seal type: single seat: 1.2×10⁻⁷
Allowable Leakage	Soft Seal	VI Class
Allowable Differential Pressure (MPa)	Positive Effect	5.09	2.91	1.85	2.18	1.33	1.52	0.99	0.62	0.6	0.69	0.39
Allowable Differential Pressure (MPa)	Counter Action	6.4	3.88	2.47	2.91	1.77	2.03	1.32	0.83	0.8	0.92	0.52
Signal Pressure (kPa)		0 or 400–600
Bonnet Form		The standard type (-17~+250°C), high temperature (+250~+450°C), low temperature (-40~–196°C), bellows seal type (-40~+350°C)
Gland Type		Bolt pressing type
Sealing Packing		V type PTFE packing, impregnated PTFE packing, asbestos braided packing, flexible graphite
Plug Form		Single seat valve
Flow Characteristics		Quick opening characteristic

(Single seater, sleeve type)connection dimensions

Nominal Diameter (mm/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″
A		196			232		308			394		498
L	PN16	150	160	180	200	230	290	310	350	400	480	600
H		53	58	70	75	83	93	100	110	125	143	170
H1		340	345	370	380	390	475	490	500	765	825	927

(Three way structure)connecting dimensions

Nominal Diameter (mm/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″
A		196			232		308			394		498
L	PN16	150	160	180	200	230	290	310	350	400	480	600
H		132	132	135	140	150	160	160	170	325	450	495
H1		340	345	370	380	390	475	490	500	765	825	927

Note: 1.The dimensions in the table are standard data without accessories. The dimensions of accessories are calculated according to the actual configuration. 2. Due to the technical innovation and improvement of the product, the size may change. Please contact the technical department of the Company for the latest information.

Specification Applications

The Pneumatic Diaphragm Cut-Off Valve is widely used in industries such as chemical processing, pharmaceuticals, food and beverage, and water treatment. It provides precise flow control and reliable shut-off capabilities for liquids, gases, and steam. Its compact design, high sealing performance, and quick response make it suitable for applications requiring tight control and minimal leakage. The valve is especially advantageous in corrosive and high-temperature environments due to its durable construction and efficient pneumatic actuation.

Valve Actuation

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