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Control valve

Huijin Valve: a professional manufacturer of regulating valves.

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ZMBQ type pneumatic membrane shut-off valve

ZMBQ type pneumatic membrane shut-off valve
product description

ZMBQ type pneumatic membrane cut-off valve adopts top-guided structure and is equipped with multi-spring actuator. It has the advantages of compact structure, light weight, sensitive action, S-streamline of fluid passage, small pressure drop loss, large valve capacity, and convenient disassembly and assembly.
The shut-off valve receives the signal from the regulating instrument, cuts, opens or changes the medium flow direction, and achieves automatic control of process parameters such as pressure, flow rate and liquid level. It is widely used in the production process automatic control and transportation control system of various industrial sectors such as petroleum, chemical industry, metallurgy, electric power, light industry and textile.
This series of products are of film type and piston type. There are three types of valve body structure: single seat, sleeve and double seat (two-position and three-way). There are two types of seals: packing seals and bellows seals. The nominal pressure levels of the products are PN10, 16, 40, and 46. The range is DN20 ~ 200mm. The applicable fluid temperature is from -60 to 450 ° C. The leakage level is grade IV or VI. The flow characteristic is fast opening.

Features

The shut-off valve adopts a multi-spring actuator and an adjustment mechanism connected with three standers. The overall height 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 flow channel with constant cross-section according to the principle of fluid mechanics, and the number of rated flow systems is increased by 30%.
There are two types of valve inner seals: tight type and soft seal. The tight type is made of hard alloy, and the soft seal type is made of high quality materials.
Balanced trims increase the allowable differential pressure of the shut-off valve.
The bellows seal type completely seals the moving valve stem, blocking the possibility of medium leakage.
Piston-type actuator with large operating force and large pressure difference.


Material of main parts

Valve body and sealing sleeve: HT200, ZG230-450, ZG1Cr18Ni9Ti, ZG1Cr18Ni12MO2Ti
Valve core and valve seat: 1Cr18Ni9T, OCr18Ni12MO2Ti, 1Cr18Ni9Ti surfacing Stellite alloy
Sleeve and valve plug: 1Cr18Ni9T, OCr18Ni12MO2Ti, 1Cr18Ni9Ti surfacing Stellite alloy
Filler: PTFE, flexible graphite
Corrugated diaphragm: Polyester fabric reinforced with nitrile rubber
Spring: 60Si2Mn
Valve stem and push rod: 2Cr13, 1Cr18Ni9Ti
Spool, plug (soft parts): reinforced PTFE
Bellows: 1Cr18Ni9Ti


Technical Parameters

Nominal diameter DN (mm)

15

20 25 32

40

50

65

80

100

125

150

200

Rated flow coefficient (KV)

Single seat, double seat

5

7

11

20

30

48

75

120

190

300

480

760

Sleeve

11 20 30 48 75 120 180 300 480 760

Nominal diameter (MPa)

1.0 1.6 4.0 6.4

Rated stroke (mm)

8 12 20 25 40 50
Effective area (C㎡) ZMQ type 100 200 400 600 1000
ZSQ type 100 125 160 250
Allowable leakage Hard seal 1 / h General: 10ˉ4 × rated capacity of valve;
Tight type: single or double seat: 1.2 × 10ˉ7, sleeve 5 × 10ˉ6 × valve capacity
Soft seal Class VI

Allowable pressure difference

(MPa)

PZMQ positive action N

6.4 5.09 2.91 1.85 2.18 1.33 1.52 0.99 0.62 0.60 0.69 0.39

PZMQ reaction N

6.4 6.4 3.88 2.47 0.91 1.77 2.03 1.32 0.83 0.80 0.92 0.52

P
ZSQ
N

6.4 6.1 3.5 2.3 3.0 1.9 1.9 1.5 0.93 0.84 0.65 0.47

M
ZQM
S

Nominal pressure
ZMQ 0 or 250
ZQM 0 or 400 ~ 600

1) The performance and indicators of this product implement GB / T4213-92;

2) If the allowable pressure difference value in the table is greater than the nominal pressure, the nominal pressure value is taken, and the nominal pressure value is less than or equal to the nominal pressure value.

3) The allowable value of the table is the standard cylinder value. Different cylinders can be used to increase the allowable pressure difference.

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