shouldself-actuated regulatorRelying on the pressure and temperature of the medium flowing through the valve as energy to drive the valve to work automatically, without the need for external power supply and secondary instruments. Also known as self operated control valve.

Self operated pressure regulating valves do not require external energy and can work in places without electricity or gas, which is both convenient and energy-saving. The pressure segmentation range is fine and intersecting with each other, with high adjustment accuracy. The pressure setting value can be continuously set during operation. For regulating the pressure after the valve, the ratio of the pressure before the valve to the pressure after the valve can be 10:1-10:8. Rubber diaphragm type detection, with high precision and sensitive action of the actuator. Adopting a pressure balance mechanism to make the regulating valve responsive and accurately controlled.

shouldOperated flow control valveMain technical parameters

Nominal diameter: DN15-250mm
Nominal pressure: PN1.6, 2.5, 4.0, 6.4MPa
Flange standards: ANSI, JIS, DIN, GB, JB (special can be provided by the user)
Connection form: flange (FF RF RTJ), welding (SW BW), thread (suitable for 1 inch or less)
Valve cover form: standard type -17~+450 ℃
Cover type: bolt compression type
Sealing packing: V-shaped PTFE packing, PTFE impregnated asbestos packing, asbestos textile packing, graphite packing
Valve core form: single seat, sleeve type valve core
Flow characteristics: Linear
Effective area (cm): 32 ※ 80 250 630
Pressure setting range (MPa): 0.8~1.6 0.1~0.6 0.015~0.15 0.005~0.035 0.3~1.2 0.05~0.3 0.01~0.07
Ensure the normal operation of the pressure valve with a small pressure difference △ Pmin (MPa): ≥ 0.05 ≥ 0.04 ≥ 0.01 ≥ 0.005
Allowable large pressure difference between upper and lower membrane chambers (MPa): 2.0 1.25 0.4 0.15
Material film cover: galvanized steel plate; Diaphragm: EPDM or FKM sandwiching fibers
Control pipeline, joint copper pipe or steel pipe 10 × 1; Card sleeve connector: R1/4 '
Note: ※ The pressure setting range corresponding to this effective area is not applicable to DN150-250.

shouldOperated flow control valveInstallation focus

When the valve is used in gas or low viscosity liquid media, the ZZY type self operated pressure regulating valve is usually installed upright on a horizontal pipe, and only installed upside down or diagonally when space does not allow.
For the convenience of on-site maintenance and operation, there should be appropriate space around the pressure regulating valve.
When the medium is clean gas or liquid, the pre valve filter may not be installed.
When the diameter of the pressure regulating valve is too large (DN ≥ 100), there should be a fixed bracket. When it is confirmed that the medium is very clean, part 3 may not be installed.
When the position is not feasible, the bypass valve (manual) can be omitted (we do not recommend it).
6. After the valve assembly, users can choose to equip check valves, safety valves, etc. as needed.
When the valve is used in steam or high viscosity liquid media, the ZZY type self operated pressure regulating valve is usually installed upside down on a horizontal pipe, and the condenser (steam self operated) should be higher than the actuator of the pressure regulating valve and lower than the front and rear connecting pipes of the valve. The condenser should be filled with cold water before use, and water should be added approximately once every three months thereafter.