Pilot-operated Self-operated Control Valve
Summary:
ZZYVP Pilot-operated type of pressure control valve is mainly composed of control valve, actuator and a command set pressure. Simply put, in general, the direct action of the valve control precision is not high. The purpose of having a conductor is to increase control accuracy. The valve does not need additional energy, and the use of the medium (gas) itself as a power source, the introduction of the command of the test actuator, which is to control the pressure regulating valve spool position, and change the valve medium flow, to make the valve back end pressure (type B) or front end pressure (type K) remain constant.
| Pilot-operated Self-operated Control Valve |
| Model |
ZZYVP |
| Size |
DN15~250mm |
| Structure Form |
Straight-through Type |
| Body Material |
Cast steel(WCB);
Stainless Steel(304;316;316L) |
| Norminal Pressure |
PN1.6; PN2.5; PN4.0MPa |
| Working Temperature |
-30~-350ºC |
| Application Range |
Non-corrosive liquids, gases and steam |
| Feature |
The control accuracy is higher for one time than self force valve. |
| Body Specification |
| Nominal Diameter |
DN20~200mm |
| Flange Standard |
ANSI,JIS,GB,JB,DIN |
| Body Material |
Cast steel; Fluorine PTFE(F46) |
| Working Temperature |
-30~-350ºC |
| Plug Material |
Stainless Steel(Metal-to-metal)
Stainless steel inlaid with rubber ring(Soft Seal) |
| Pressure Balance |
Stainless Steel Bellows(DN15-125)
Balance Diaphragm(DN150-250) |
| Temperature Range of Control Valve |
| Allowable Working Temperature |
| Nominal diameter |
|
DN15-125mm |
DN150-250mm |
Sealing Type |
Metal-to-metal |
≤150ºC |
≤140ºC |
| cooling tank≤200ºC |
cooling tank&lengthen≤200ºC |
| cooling tank&Heat dissipation≤350ºC |
cooling tank&lengthen≤350ºC |
| Soft Seal |
≤150ºC |
Features:
The pressure setting value of the self-operated pressure control valve with the conductor can be realized on the conductor. It can be adjusted at will during operation. The control precision is about one time higher than that of a direct operation of the self-valve, and it is suitable for high precision control occasions. Detection and execution components are made of high temperature resistant materials. It can also be used for high temperature (200 ° C) water vapor without any condenser.
Working principle:
As for the pilot-operated self-operated pressure control valve, when the pressure of the regulated medium increases, the pressure acting on the lower pressure of the main valve diaphragm is greater than the pressure above, and the spool moves upward to reduce the flow cross section. In this way, the pressure behind the valve drops slightly. Conversely, when the pressure of the regulated medium decreases, the pressure acting on the command diaphragm decreases.
Company Introduction:
Zhitai Valve Co., Ltd is a member of Valve Association of Longwan District, is located in Longwan Central Industrial Zone, Wenzhou City. It'a professional technology company integrated with development, manufacturing, sales, and after-sales services of valve actuators and and self-controlled valves. Presently, our main products include: pneumatic actuators, pneumatic valves and pneumatic control valves; electric actuators, electeic valves and eletric control valves; automatic control products. Our products are widely applied in natural gas, electricity, petroleum, chemical, metallurgical, construction, pharmacy, paper, printing and dying. Zhitai series actuators and valves are the best choice for automatic fluid control engineering and equipment manufacturing. We sincerely welcome customers from home and abrode to visit us for supervision, communication and cooperation. It's a great honor for us to cooperate with you.
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