- COVNA Pneumatic Control Valve -
Helping your automation equipment achieve accurate metering and measurement

ZJH Pneumatic Control Valve

ZJH Pneumatic Control Valve comprises a multiple spring zero adjustable actuator, a low flow resistance sleeve and a single seat regulation valve without lower cover. Features of ZJH series pneumatic control valve include lightweight, large flow capacity. Low center of gravity, high vibration resistance and easy to install.

Widely used in ethanol/bio-fuel loading systems, LPG-NGL loading/unloading systems, skid mounted loading systems, vapor recovery units and so on.

(Please note that COVNA brand is a Chinese brand and we do not supply other brand control valves. Thank you)

Item	ZJHP Single Seat Pneumatic Control Valve ZJHM Pneumatic Sleeve Control Valve
Size Range	DN20 to DN300
Pressure Range	16/40/64bar
Air Supply Pressure Range(KPa)	0.14, 0.25, 0.40
Medium Temperature	-40°F to 482°F
Material Options	Stainless Steel(304 or 316), Carbon Steel
Construction Options	Single Seat type or Sleeve type

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Features Of Pneumatic Control Valve:

Pneumatic control valve with the top guide structure, compact structure, fluid channels in an s-shaped streamline, small pressure drop loss large flow, wide adjustment range, high precision flow characteristics. Pneumatic control valve with multi-spring diaphragm actuator, with small structure, large output force.

Using this valve can make the flow control more accurate, and make the automation easier, thereby improving the production efficiency of your project.

Pneumatic control is safer and can be used in industries with harsher working environments to protect the personal safety of workers.

Pneumatic Control Valve With Heat Dissipation Part

With good heat dissipation

Pneumatic Bellows Control Valve

With good sealing performance and good heat dissipation

Pneumatic Fluorine-Lining Control Valve

With excellent anti-corrosion performance for the chemical industry

COVNA Control Valves, Your Best Choice For Automation Facility

● Providing sample services to help you complete your prototype design

● Offering cost-effective solutions

● Modbus control increases the accuracy of flow control up to 99.99%

● No blind spots inside the valve body to ensure accurate flow control

● Lightweight and easy to installation

Working Principle Of Pneumatic Control Valve:

By receiving the control signal pressure output by the standard electric signals of the regulator(via electricity-air positioner or electricity-air converter), the valve opening is changed, so as to change the flow of the medium to be regulated and then allow parameters such as flow, pressure, temperature and liquid level to be regulated. As a result, the production process automation is achieved.

After the extraneous pneumatic pressure signal is input into the diaphragm chamber, it will act on the diaphragm to produce thrust. The thrust them compress the spring pack, and move the push rod, which drives the spindle to open(close) of the valve clack until the balance is achieved between the thrust and reaction of the compressed spring pack and the clack is in a stable position of the stroke. It is concluded from the above principle. There is a definite proportional relation between the clack and the input pressure signal.

Single Seat Type

Sleeve Type

Technical Parameter Of Pneumatic Control Valve:

Nominal Diameter		G 3/4″	20				25		40			50			65			80			100			150			200			250	300
Valve Seat Diameter		3 4 5 6 7 8	10	12	15	20	20	25	25	32	40	32	40	50	40	50	65	50	65	80	65	80	100	100	125	150	125	150	200
Rated Flow Coefficient Cv	High Accuracy Flow Characteristic Clack	0.08 0.12 0.20 0.32 0.50 0.80	1.8	2.8	4.4	6.9	6.9	11	11	17.6	27.5	17.6	27.5	44	27.5	44	69	44	69	110	69	110	176	176	275	440	275	440	690	1000	1600
	High Capacity Flow Characteristic Clack		1.6	2.5	4	6.3	6.3	10	10	16	25	16	25	40	25	40	63	40	63	100	63	100	160	160	250	400	250	400	630	900	1440
Rated Strock(mm)		10	16						25						40									60						100
Effective Diaphragm Area (cm2)		220	350												560									900						1400
Inherent Regualtion Ratio		50:1
Nominal Pressure MPa		0.16 1.6 4.0 6.4 (ANSI125 150 300 600LB)(JIS10 16 20 30 40K)
Sevice Temperature		-20 to 200℃ -40 to 250℃ -40 to 450℃ -60 to 450℃
Ambient Temperature		-40 to 85℃
Air Supply Pressure KPa		0.14(0.25 0.4)
Spring Range KPa		20 to 100(40 t o200 80 to 40 20 to 60 60 to 100)
Connection Threaded		Female Thread M10×1

Material Options:

In order to better meet the needs of your equipment, we will provide you with other materials for you to choose from

Available in Cast Iron, Stainless Steel 304, Stainless Steel 316 and Carbon Steel to meet your requirement of temperature and mediums.