Product Details:

ZMHNDirect acting pressure regulating valve

ZMHN direct acting pressure regulating valve is a type of regulating valve that does not require external energy and operating medium. It operates independently based on the energy of the controlled fluid and maintains a constant variable before or after the valve. It is used to automatically regulate the pressure of non corrosive gases, petroleum, and steam below 200 ℃ to a given value. It has the advantages of simple structure, reliable operation, easy maintenance, fire and explosion prevention, and low cost.

working principle
The regulating signal of the pressure regulating valve with direct action after the valve is obtained from the pipeline behind the valve. With the increase of the regulated pressure acting on the membrane chamber and overcoming the force generated by the heavy hammer, the valve core moves downward and gradually closes with the valve seat, reducing the flow cross-section. The valve core moves upward, increasing the flow cross-section until the regulated pressure equals the given value. The regulating signal of the direct acting pressure regulating valve in front of the valve is obtained from the pipeline in front of the valve. With the increase of the regulated pressure acting on the membrane chamber, it overcomes the force generated by the heavy hammer, and the valve core moves downward, gradually leaving the valve seat, increasing the flow cross-section until the pressure in front of the valve drops to the given value; On the contrary, when the pressure on the membrane chamber is effective, the force generated by the heavy hammer causes the valve core to rise and gradually close with the valve seat, reducing the flow cross-section until the pressure in front of the valve increases to the given value.

Technical parameters and performance
Adjustment range: Membrane chamber 1: 0.5-1.3; Membrane chamber 2: 0.1-0.5; Membrane chamber 4: 0.015-0.1MPa

valve body
Type: Straight through double seat cast ball valve nominal diameter: 25, 32, 40, 50, 65, 80, 100, 125, 150, 200mm nominal pressure: PN1.6MPa flange standards: JB79-59, JB78-59, etc. Materials: cast iron (HT200), cast steel (ZG230-450), cast stainless steel (ZG1Cr18Ni9Ti), etc. Medium temperature: -20~+220 ℃ (when the medium temperature is greater than 40 ℃, water or liquid that is not mixed with the medium needs to be filled in the upper chamber, or a condenser can be added to the pressure pipeline) Capping type: bolt compression packing: V-shaped polytetrafluoroethylene packing

Valve components
Valve core type: Double seat plunger valve core

actuator
Type: Pneumatic thin lever actuator Diaphragm material: Nitrile rubber with nylon cloth Environmental temperature: -25~+55 ℃ Diaphragm cover joint: M16 × 1.5 Diaphragm cover material: HT200 Valve action type: There are two types: valve front type and valve rear type. The valve rear type and valve front type are used to maintain a constant pressure in the pipeline behind and in front of the regulating valve, respectively

Performance
Leakage rate: 5 × 10-3 less than the rated capacity of the valve Adjustable range: 30:1

Kv value and rated stroke

Membrane chamber type and weight configuration

flow characteristics

Quick opening feature

1. Equal percentage type 2. Linear type 3. Quick opening characteristic

Flange distance and external dimensions