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ZXN pneumatic double seat control valve

ZXN pneumatic double seat control valve

Product introduction: ZXN new series pneumatic diaphragm double seat control valve adopts double guide structure and multi spring actuator. It has the advantages of compact structure, light weight, sensitive action, large valve capacity, accurate flow characteristics and convenient disassembly. Widely used in accurate control of gas, liquid, steam and other media, process parameters such as pressure, flow, temperature, liquid level to maintain a given value.

  • Item NO.:

    XUVAL77-31
  • Lead Time:

    45Days
  • Product Orgin:

    CHIHA
  • Brand:

    XUVAL
  • Shipping Port:

    Shanghai
  • Payment:

    100%TT
  • Color:

    Silvery
  • MOQ:

    10
Products Details

ZXN pneumatic double seat control valve

Pneumatic double seat control valve is especially suitable for medium with large allowable pressure difference and large allowable leakage, which is not very clean. This series of products are standard type, bellows sealing type, jacket insulation type and other varieties. The nominal pressure grades of the products are PN10, 16, 40 and 64, the diameter range of the valve body is DN20 ~ 200, and the applicable fluid temperature ranges from - 200 ℃ to 560 ℃. The standard of leakage is grade II or IV. The flow characteristics are linear or equal percentage.


Product features:

1. Double guide and double seat control valve at the top and bottom, with good stability.
2. There are two valve cores and valve seats, and the "four-way" valve body is adopted, which can be easily changed from normal installation to reverse installation, and the gas closing valve can be changed into gas opening valve.
3. The valve body is designed according to the principle of hydrodynamics, and the constant section low sulfur resistance channel has large rated flow coefficient.
4. The unbalanced force is small and the allowable pressure difference is large.
5. The actuator adopts multi spring structure, which reduces the height by 30% and weight by 30%.
6. Wide adjustable range, inherent adjustable ratio is 50%
7. ZXNV bellows seal control valve forms a complete seal to the moving valve stem. Shut off fluid leakage.

8. ZXNJ type control valve is equipped with heat preservation jacket, which is used for the occasions where the fluid is easy to crystallize and solidify after cooling.


Material of main parts:
Valve body and cover: HT200
50ZG core, valve seat: 1Cr18Ni9Ti, Stellite butt welding
Packing: PTFE, flexible graphite
Bellows: 1Cr18Ni9Ti
Fillers: Rubber asbestos board, 10 #, 1Cr18Ni9Ti, asbestos spiral wound gasket
Membrane cover: A3
Corrugated diaphragm: NBR clip reinforced polyester fabric
Spring: 60SIMN
Stem and push rod: 2Cr13, 1Cr18Ni9Ti
Bushing: 2Cr13
Soft sealing valve core: Reinforced Polytetrafluoroethylene


Product structure chart:



Technical parameter

Nominal diameter DN (mm)
25 32 40 50 65 80 100 125 150 200
Rated flow coefficient(KV)

Straight line
12.1 19.4 30.3 48.3 75.9 121 193.6 302.5 484 759
Equal percentage
11 17.6 27.5 44 69.3 110 176 275 440 693
Rated stroke L (mm)
16
25
40
60



Effective area of diaphragm AE (cm2)
280
400
600
1000




Nominal pressure PN (MPA)
1.6、4.0、6.4


Inherent flow characteristics
Straight line, equal percentage
Inherent adjustable ratio
50
Signal range pr (kPa)
20~100、40~200、20~60、60~100、80~240
Gas source pressure PS (MPA)
0.14~0.4
Allowable leakage (L/h)
Grade II (5) × 10-3 × Valve rated capacity) class IV (10-3 × Valve rated capacity)
Working temperature T (℃)
Normal temperature type
-20~200、-40~250、-60~250
Heat dissipation type
-40~450、-60~450
High temperature type
450~650
Low temperature type
-60~-100、-100~-200、-200~-250


Allowable differential pressure

Film adhesive area AE (cm2)
280
400
600
1000
Signal range pr (kPa)
20-100 40-200 20-100 40-200 20-100 40-200 20-100 40-200
Gas source pressure PS (MPA)
0.14 0.25 0.14 0.25 0.15=4 0.25 0.14 0.25
Accessories required
- P - P - P - P
Common
call
through
path
DN
(mm)
and
valve
Seat
straight
path
d
(mm)

25 12 5.57 6.40



32 15

6.16 6.40

40
20

5.57 6.40

25

6.16 6.40





4.90 6.40

50
25

6.16 6.40

32

4.90 6.40

65 32



4.48 6.40
80

40





3.90 6.40
50



4.48 6.40
65



3.63 6.40
100
50



4.48 6.40
65



3.63 6.40
70



2.90 6.40
125 65



3.85 6.40
150
70



2.89 6.40
100



3.85 6.40
125



3.20 6.40
200
100



3.85 6.40
125



3.20 6.40
150



1.60 4.81
*P: Valve positioner
**For the allowable differential pressure of the reduced volume valve body, the allowable differential pressure of the full volume valve body with the same diameter shall be used.


Connection standard:

Flange standard: cast iron flange according to jb78-59
Cast steel flange according to gb9113-88, JB / t79.1-94
Flange sealing surface type: PN10, PN16 are convex surface;
PN40 and pn64 are concave and convex, and the valve body is concave.
The structure length is in accordance with the standard of gb12221-89
Diaphragm actuator gas signal interface: internal thread M16 × one point five
Jacket heat carrier interface: butt welding φ eighteen × four


Packing & Delivery : 

Packing Details:all by seaworthy plywood case and packed strongly by packing belt as below
Delivery Details:Generally it is 5-10 days if the goods are in stock. or15-30 days if the goods are OEM or not
enough subject to the order quantity. But anyway, normally, we are able to make sure the delivery will not exceed 45days.






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