The ZJHN type precision small pneumatic thin film double seat regulating valve has two valve seats inside the valve body. The fluid flows out through the upper and lower sealing surfaces of the valve core, with low unbalanced force. It is a balanced structure that allows for the use of large pressure differentials and is suitable for situations with large pressure differentials, high flow rates, and less strict leakage requirements. It is widely used in industrial sectors such as petroleum, chemical, pharmaceutical, metallurgical, power station, etc., to control media such as gases, liquids, and steam.

1、 Valve body
Valve body form: Straight through double seat cast ball valve
Nominal diameter: 25-300mm
Nominal pressure: PN1.66.4MPa
Connection type: flange type according to JB78-59JB79-59
Material: HT200ZG230-450ZG1Cr18Ni9TiZG0Cr18Ni12Mo2Ti
2、 Upper valve cover
Room temperature type: -20 ℃~+200 ℃
Heat dissipation type: -40 ℃~+450 ℃
Cover form: bolt compression type
Packing: V-shaped polytetrafluoroethylene packing, flexible graphite, stainless steel corrugated pipe.
3、 Valve components
Valve core type: Double guide double seat plunger type valve core
Flow characteristics: linear characteristics, equal percentage characteristics, or quick opening characteristics
Material: 1Cr18Ni9Ti0Cr18Ni12Mo2Ti



4、 Executing Agency
Type: Multi spring thin film actuator
Membrane material: Nitrile rubber clip reinforced polyester fabric
Spring range: 0.02~0.1, 0.04~0.20MPa
Gas supply pressure: 0.140-160.28MPa
Air source connector: M10 × 1
Environmental temperature: -30~+70 ℃
5、 Valve action type: gas closed or gas open
Attachment: Positioner, Handwheel Mechanism
Performance: (with locator)
Leakage rate: less than 0.5% of the rated flow coefficient Kv
Basic error: ± 1.5%
Return difference: 1.5%
Dead zone: 0.6%
Constant point deviation: ± 1.5%
Adjustable range: 30:1

6、 Flow coefficient Kv and stroke, allowable pressure difference

7、 External dimensions

nominal path	execute institution	H		ΦA	H1	L
		Room temperature type	heat dissipation type			PN1.6	PN4.0	PN6.4
twenty-five	ZHA22	four hundred and ninety-eight	six hundred and forty-eight	two hundred and eighty-five	one hundred and seventeen	one hundred and eighty-five	one hundred and ninety	two hundred and five
thirty-two	ZHA22	five hundred and one	six hundred and fifty-one	two hundred and eighty-five	one hundred and twenty	two hundred	two hundred and ten	two hundred and twenty
forty	ZHA22	five hundred and twenty-two	six hundred and ninety-one	two hundred and eighty-five	one hundred and thirty-nine	two hundred and twenty	two hundred and thirty	two hundred and forty
fifty	ZHA22	five hundred and thirty	six hundred and ninety-nine	two hundred and eighty-five	one hundred and forty-four	two hundred and fifty	two hundred and fifty-five	two hundred and sixty-five
sixty-five	ZHA34	six hundred and forty-five	eight hundred and fifteen	three hundred and sixty-three	one hundred and eighty-eight	two hundred and seventy-five	two hundred and eighty-five	two hundred and ninety-five
eighty	ZHA34	six hundred and sixty-one	eight hundred and thirty-five	three hundred and sixty-three	two hundred and eight	three hundred and five	three hundred and ten	three hundred and twenty-five
one hundred	ZHA34	six hundred and eighty-seven	eight hundred and eighty-seven	three hundred and sixty-three	two hundred and twenty	three hundred and fifty	three hundred and fifty-five	three hundred and seventy
one hundred and twenty-five	ZHA34	one thousand two hundred and thirty-four	one thousand four hundred and forty-four	three hundred and sixty-three	two hundred and seventy	four hundred and ten	four hundred and twenty-five	four hundred and forty
one hundred and fifty	ZHA45	one thousand two hundred and forty-two	one thousand four hundred and ninety-two	four hundred and seventy	two hundred and eighty	four hundred and fifty	four hundred and sixty	four hundred and seventy-five
two hundred	ZHA45	one thousand three hundred and ninety-four	one thousand six hundred and fifty-four	four hundred and seventy	three hundred and twenty	five hundred and fifty	five hundred and sixty	five hundred and seventy

8、 Model designation description

Z	J	H	N	twenty-five	P	G	B
self-control valve	Executing Agency:	Executing Agency:	Valve structure type:	Nominal pressure:	Valve body material:	Temperature type:	Type of action:
	J: Indicating small and precise size	Multi spring pneumatic thin film	P: Indicating a single seat	16: Indicating 1.6MPa	C: Representing carbon steel	G: Medium temperature type, room temperature omitted	K: Indicating air opening type
			N: Representing two seats	25: represents 2.5MPa	P: Representing stainless steel		B: Indicate the type of air seal
			M: Indicating sleeve valve	40: represents 4.0MPa
				64: represents 6.4MPa

9、 Ordering Notice

1. Product model and name 6. Rated flow coefficient

2. nominal diameter DN (mm) 7. medium type and temperature range

3. nominal pressure 8. pressure difference before and after the valve

4. Flow characteristics 9. Control signals

5. Valve body material 10. Other special requirements