Pilot-operated safety valve
A pilot-operated safety valve and valve core technology, applied in the field of safety valves, can solve the problems of low working efficiency, waste of medium, long working time, etc., and achieve the effects of high working efficiency, reducing medium pressure and short working time.
Pending Publication Date: 2019-05-31
ZHEJIANG ZHONGMEI MACHINERY TECH
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Problems solved by technology
[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of long working time, low working efficiency and easy waste of medium when the pilot safety valve in the prior art is reused, so as to provide a short working time and high working efficiency, Pilot-operated safety valve that does not misdischarge the medium
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[0031] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0032] In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for description purposes only, and should not be understood as indicating or implying relative importance.
[0033] In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.
[0034] The pilot safety valve of this embodiment, such as figure 1 with 2...
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The invention provides a pilot-operated safety valve. The pilot-operated safety valve comprises a valve body and a main valve element, wherein the main valve element is arranged on the valve body. Themain valve element performs reciprocating motion to enable a liquid inlet and a liquid outlet to be connected with each other or disconnected from each other. The side, away from the liquid inlet, ofthe main valve element is provided with a first cavity. The first cavity communicates with the liquid inlet through one or more flow limiting channels formed in the main valve element. The pilot-operated safety valve further comprises a pressure preservation structure. The pressure preservation structure is arranged on the main valve element. The medium pressure in the first cavity is greater than or equal to the medium pressure of the liquid inlet, the pressure preservation structure acts so that the flow limiting channels can be disconnected. When the pilot-operated safety valve is not usedafter the pressure relief value is set, a medium in the first cavity cannot flow into the liquid inlet through the flow limiting channels; after the pilot-operated safety valve is reused, even if themedium with the high pressure is introduced instantly, the main valve element can maintain the closed state under the effect of the medium pressure in the first cavity; and thus, the operation time is short, the work efficiency is high, and the medium cannot be discharged by mistake.
Description
technical field [0001] The invention relates to the technical field of safety valves, in particular to a pilot-operated safety valve. Background technique [0002] The safety valve is a pressure control valve. When the pressure of the medium in the equipment or pipeline rises above the set value, the safety valve discharges the medium out of the pipeline to reduce the internal pressure to ensure the safety of the equipment and pipeline. Safety valves generally include direct-acting safety valves and pilot-operated safety valves. Pilot-operated safety valves are widely used because of their advantages such as good sealing, good pressure stabilization performance, and long service life. [0003] Chinese patent document CN202510778U discloses a new pilot safety valve, including a main valve and a pilot valve. The main valve includes a valve body, a valve seat, a valve disc, and a valve cover. A spring is arranged between the valve disc and the valve cover. A spring cavity is f...
Claims
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IPC IPC(8): F16K17/06F16K17/164
Inventor 陈仁建孔文平崔锐王博赵亮亮袁建立陈腾亚娄军辉王浩倪伟强郑铠施政浩郑巨静
Owner ZHEJIANG ZHONGMEI MACHINERY TECH