The ZJHP pneumatic flow control valve is a commonly used pneumatic control valve model for regulating various gas and liquid medium flow rates, pressures, and other parameters. It is driven by a gas source and equipped with accessories such as locators. It receives current or voltage analog signals from the control system, adjusts the opening of the valve, and achieves automatic control of the working conditions.

1ZJHPOverview of Pneumatic Flow Control Valve

ZJHP pneumatic flow control valve is a new generation of small pneumatic single seat control valve, which is a new type of pneumatic control valve developed by integrating advanced technologies at home and abroad and has the international advanced level in the 1990s. There are two types of valve bodies: single seat valves and sleeve valves, which are the development direction of regulating valves today.

ZJHPPneumatic flow control valveIt consists of a multi spring pneumatic diaphragm actuator and a top guided through low flow resistance single seat valve. It has a compact structure, light weight, sensitive movement, and fluid channelsSStreamlined, low pressure drop loss, large valve capacity, precise flow characteristics, equipped with electricity-Pneumatic valve positioning or pneumatic valve locator can achieve automatic adjustment and control of fluid media in process pipelines, and is widely used for precise control of process parameters such as pressure, flow rate, temperature, liquid level, etc. of gas, liquid, steam and other media to maintain them at given values. If there is no gas source on site, an electric straight through regulating valve can be chosen as a substitute if the working conditions permit.

IIZJHPStructural characteristics of pneumatic flow control valve

1．ZJHPPneumatic flow control valve is the execution unit of instruments in automation control systems, which uses electricity-Pneumatic valve positioner, powered by electrical signals and compressed air, receives input from the control system0-10mA DCperhaps4-20mA DCThe current signal is converted by the regulator into a compressed air source pressure signal input and output, which can achieve segmented control (amplitude signal), thereby changing the valve opening displacement and achieving precise adjustment and control of the process parameters of the fluid medium
2．ZJHPPneumatic flow control valves can be classified according to their operating modes; Positive effect: Air closed type-Normally open type (when the signal pressure increases, the valve position shifts downward), 《BType>Reaction: Air opening type-Normally closed type (when the signal pressure increases, the valve position shifts upward), 《KType "
3．ZJHPThe pneumatic flow control valve is a straight through single seat cast spherical valve with a single seat plunger type valve core, which is particularly suitable for working environments where leakage is allowed to be small and the pressure difference between the front and back of the valve is not significant.
4The straight through low flow resistance single seat is a bottomless and top guided structure, with only one valve seat and one plunger shaped valve core, which has good sealing performance, small leakage, sensitive action, and fluid channelSStreamlined design, low pressure drop loss, large valve capacity, precise flow characteristics, large adjustable ratio, large guiding area of valve core, strong anti vibration performance, etc., suitable for occasions with strict requirements for medium leakage and adjustment accuracy. However, due to the structural reasons of the valve, the unbalanced force on the valve stem is relatively large, especially in working conditions with large nominal diameter, so this valve is only suitable for occasions with small working pressure difference.
5By changing the design of the valve core shape; Different valve core shapes will result in different flow characteristics: equal percentage (logarithmic), linearity, and quick opening characteristics.
6According to the requirements of the operating conditions, the valve core can be designed and manufactured; Soft sealing structure (suitable for-20~+120Acid, alkali, gas and other media that require tight sealing within the temperature range of ℃.
This series of products is widely used in the automation and remote control of industrial production processes such as chemical, petroleum, metallurgy, power plants, textiles, papermaking, and pharmaceuticals. There are various types including standard type, adjustable cutting type, corrugated pipe sealing type, jacket insulation type, etc. The product pressure level includesPN1.6 4.0 6.4MPa; nominal diameterDN15~300mm; Small valve coreDN6mmApplicable fluid temperatures include-60~+450℃； According to the temperature, different valve covers can be divided into room temperature type, high temperature type, and low temperature type.

IIIZJHPPneumatic flow control valve actuator

The ZJHP pneumatic flow control valve type multi spring pneumatic diaphragm actuator consists of main components such as diaphragm, compression spring, tray, push rod, bracket, shaft sleeve, and diaphragm cover. It's for the old-fashioned onesZMA/BA new type of pneumatic thin film actuator designed and developed to address issues such as large size, heaviness, and unreliable deep corrugated membranes in single spring pneumatic thin film actuators. The membrane cover plate, limiting components, and other parts are all stamped from steel plates. The shape of the membrane is complex, and a special pressing process is used to achieve explosive strength22kg/cm2above. The multi spring form improves the processability of spring manufacturing and facilitates the assembly of different spring ranges. The adjustable zero function improves linear accuracy. The surface treatment uses epoxy electrostatic powder without spraying, which has high fastness and corrosion resistance. It has the advantages of uniform force distribution, good stability, small size, and light weight. Powered by compressed air and receiving electricity-The pressure signal of the gas source input by the gas valve locator or solenoid valve acts on the diaphragm of the diaphragm chamber to generate thrust and compress the spring assembly, causing the push rod to shift. When the reaction force generated by the compression of the push rod and the spring assembly is balanced, the valve stem stabilizes at the corresponding stroke. According to the principle of force balance, the stroke size is proportional to the input pressure signal size, thereby achieving accurate positioning of the valve core.

4ZJHPMaterial of parts for pneumatic flow control valve

Valve body and valve cover:HT200，ZG230-450 ZG1Cr18Ni9Ti
Valve core and seat:1Cr18Ni9TiSitailai alloy overlay welding
Soft seal valve core: reinforced polytetrafluoroethylene
Packing: polytetrafluoroethylene, flexible graphite
Bellows:1Cr18Ni9Ti
Gasket: Rubber asbestos board10、1Cr18Ni9TiAsbestos wrapped gasket
Membrane cover:A3
Ripple film: Nitrile rubber clip reinforced polyester fabric
Spring:60Si2Mn
Valve stem and push rod:2Cr13、1Cr18Ni9Ti
Lining:2Cr13

5ZJHPPerformance parameters of pneumatic flow control valve

*The performance indicators of this product are implementedGB/T4213-92standard

6、 Performance indicators of ZJHP pneumatic flow control valve

7ZJHPDimensions of Pneumatic Flow Control Valve

8ZJHP Pneumatic Flow Control Valve Ordering Notice

1ZJHP Pneumatic flow control valve nominal diameter（mm）Nominal pressure（MPa）.

2ZJHP Pneumatic flow control valve flow coefficient（Kv）.

3ZJHThe working temperature and range of the P pneumatic flow control valve.

4ZJHThe working mode of the P pneumatic flow control valve.

5ZJHP Pneumatic flow control valve body, valve internals, and packing material.

6ZJHAccessories for P pneumatic flow control valve.