ZXN Pneumatic Thin Film Double Seat Regulating ValveDetailed product description：

ZXN Pneumatic Thin Film Double Seat Regulating Valve Product Features:

1. Top bottom, layer dual directional dual seat regulating valve, with good stability during operation.  
2. There are two valve cores and seats, using a "four-way" valve body, which can be easily retrofitted from front to back, and the gas closing valve can be changed to a gas opening valve
3. The valve body is designed according to the principles of fluid dynamics, with a low flow resistance flow channel of equal cross-section and a high rated flow coefficient.  
4. The unbalanced force is small, and a large pressure difference is allowed to be used.  
5. The actuator adopts a multi spring structure, reducing the height by 30%. Reduce weight by 30%.  
6. The adjustable range is large, with an inherent adjustable ratio of 50%.  
7. The ZXNV bellows sealed regulating valve forms a complete seal against the moving valve stem, blocking fluid leakage.  
8. The ZXNJ type regulating valve is equipped with an insulation jacket, which is used in situations where the fluid is prone to crystallization and solidification after cooling, causing blockage.

The ZXN regulating valve adopts a dual guide structure and is equipped with a multi spring actuator, which has the advantages of compact structure, light weight, sensitive action, large valve capacity, precise flow characteristics, and easy disassembly and assembly. ZXN regulating valves are widely used for precise control of gas, liquid, steam and other media, with process parameters such as pressure, flow rate, temperature, and liquid level maintained at given values. Pneumatic thin film dual seat regulating valve is particularly suitable for medium applications with large allowable pressure difference and leakage, which are not very clean.
There are various types of ZXN regulating valves in this series, including standard type, regulating cut-off type, corrugated pipe sealing type, jacket insulation type, etc. The nominal pressure rating of the product includes PN10, PN16, PN40, and PN64; The valve body diameter range is DN20~200. Suitable for fluid temperatures ranging from -200 ℃ to 560 ℃ in various grades. The leakage standard has IV or VI level. The flow characteristics are linear or equal percentage. A variety of varieties and specifications are available for selection.

ZXN type pneumatic thin film double seat regulating valve main component materials:

valve body, valve cover	50ZG core, valve seat	Packing material	bellows	gasket	Membrane cover	Ripple membrane	spring	Valve stem, push rod	bushing	Soft seal valve core
HT200	1Cr18Ni9Ti， Stellite alloy overlay welding	Polytetrafluoroethylene, flexible graphite	1Cr18Ni9Ti	Rubber asbestos board, 10 #, 1Cr18Ni9Ti, asbestos wrapped gasket	A3	Dingqing rubber clip reinforced polyester fabric	60SiMn	2Cr13、1Cr18Ni9Ti	2Cr13	Enhanced polytetrafluoroethylene

Technical parameters of ZXN pneumatic thin film double seat regulating valve:

Nominal diameter DN (mm)

twenty-five

thirty-two

forty

fifty

sixty-five

eighty

one hundred

one hundred and twenty-five

one hundred and fifty

two hundred

Rated flow coefficient （ KV）

straight line

twelve point one

nineteen point four

thirty point three

forty-eight point three

seventy-five point nine

one hundred and twenty-one

one hundred and ninety-three point six

three hundred and two point five

four hundred and eighty-four

seven hundred and fifty-nine

equal percentage

eleven

seventeen point six

twenty-seven point five

forty-four

sixty-nine point three

one hundred and ten

one hundred and seventy-six

two hundred and seventy-five

four hundred and forty

six hundred and ninety-three

Rated travel L (mm)

sixteen

twenty-five

forty

sixty

Effective area of membrane Ae (cm2)

two hundred and eighty

four hundred

six hundred

one thousand

Nominal pressure PN (MPa)

1.6, 4.0, 6.4

Inherent flow characteristics

Straight line, equal percentage

inherent adjustable ratio

fifty

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 rate (l/h)

Level II (5 × 10-3 × valve rated capacity) Level IV (10-3 × valve rated capacity)

Working temperature t (℃)

Room 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

Note: The performance indicators of this industry comply with the GB/T4213-92 standard.

ZXN type pneumatic thin film double seat regulating valve allows pressure difference:

Area Ae (cm2)			two hundred and eighty		four hundred		six hundred		one thousand
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)			zero point one four	zero point two five	zero point one four	zero point two five	zero point one four	zero point two five	zero point one four	zero point two five
Accessories required			-	P	-	P	-	P	-	P
public call, name, say, weigh through path DN （ mm） and valve seat straight path d (mm)	twenty-five	twelve	five point five seven	six point four zero
	thirty-two	fifteen			six point one six	six point four zero
	forty	twenty			five point five seven	six point four zero
		twenty-five			six point one six	six point four zero
					four point nine zero	six point four zero
	fifty	twenty-five			six point one six	six point four zero
		thirty-two			four point nine zero	six point four zero
		forty			three point nine zero	six point four zero
	sixty-five	thirty-two					four point four eight	six point four zero
	eighty	forty					three point nine zero	six point four zero
		fifty					four point four eight	six point four zero
		sixty-five					three point six three	six point four zero
	one hundred	fifty					four point four eight	six point four zero
		sixty-five					three point six three	six point four zero
		seventy					two point nine zero	six point four zero
	one hundred and twenty-five	sixty-five							three point eight five	six point four zero
	one hundred and fifty	seventy							two point eight nine	six point four zero
		one hundred							three point eight five	six point four zero
		one hundred and twenty-five							three point two zero	six point four zero
	two hundred	one hundred							three point eight five	six point four zero
		one hundred and twenty-five							three point two zero	six point four zero
		one hundred and fifty							one point six zero	four point eight one

Note: * P: Valve positioner * * For the allowable pressure difference of the reduced volume valve body, the allowable pressure difference of the full volume valve body with the same diameter shall be measured.

ZXN type pneumatic thin film double seat regulating valve connection standard:

Connection standard for dynamic film dual seat regulating valve:

Flange Standard Cast iron flange according to JB78-59; Cast steel flanges shall be in accordance with GB9113-88 and JB/T79.1-94 Flange sealing surface type PN10 and PN16 are convex surfaces; PN40 and PN64 are concave convex surfaces, and the valve body is concave. The structural length shall comply with GB12221-89 standard. Thin film actuator gas signal interface Internal thread M16 × 1.5 Jacket insulation type jacket heat carrier interface Butt welding with a diameter of 18 × 4

Note: The valve body flange and flange end face distance can be manufactured according to user specified standards, such as ANSI JIS JPI and other standards.