Pressure control method for high-pressure regulator to prevent internal leak, and high-pressure shut-off valve

Abstract

Proposed are a pressure control method for a high-pressure regulator to prevent internal leak, and a high-pressure shut-off valve so as to minimize an internal leak, due to high-pressure gas remaining in a high-pressure fuel line when a valve of a gas storage tank is shut off, caused by a pressure difference between a front end portion and a rear end portion of the high-pressure regulator introducing or discharging high-pressure gas. Accordingly, the convenience for connecting work is provided, the high safety is ensured, and the high-pressure regulator is used with the high reliability.

What is claimed is: 
     
         1 . A high-pressure shut-off valve for a high-pressure regulator, which is provided between a high-pressure fuel line connected to a gas storage tank and the high-pressure regulator, the high-pressure shut-off valve comprising:
 a body housing provided at an outer side thereof with a connection terminal and including a bobbin provided in the body housing and wound with a coil;   a coupling fixing member disposed at a front end of the body housing, in which the coupling fixing member has one end fixedly coupled to an inlet chamber of an inlet port of the high-pressure regulator and an opposite end fixedly inserted into the body housing, and the coupling fixing member includes a plunger provided to reciprocate inside the coupling fixing member and having an inflow passage for opening and closing an inlet in the inlet port; and   a connection fixing member disposed at a rear end of the body housing in which the connection fixing member has one end inserted and fixed into the body housing and an opposite end protruding to an outside of the body housing and fixedly fastened to the high-pressure fuel line, and is formed therein with a supply passage.   
     
     
         2 . The high-pressure shut-off valve of  claim 1 , further comprising a first airtight ring fixed to an outer side of a position of the coupling fixing member where the coupling fixing member abuts an entrance of the inlet port. 
     
     
         3 . The high-pressure shut-off valve of  claim 1 , wherein the plunger includes an opening/closing member formed at a front end of the plunger to open/close an inlet, and a plunger rod formed therein with an inflow passage and fixedly coupled to the opening/closing member to reciprocate, in which a spring is interposed between the plunger rod and the connection fixing member. 
     
     
         4 . The high-pressure shut-off valve of  claim 3 , wherein the opening/closing member has a conical shape corresponding to the inlet, in which a second airtight ring is fixedly coupled to an outer surface of the opening/closing member. 
     
     
         5 . The high-pressure shut-off valve of  claim 1 , wherein the inflow passage comprises a passage corresponding to the supply passage while one side of the spring is inserted into the passage, and a plurality of inflow holes directed to the inlet chamber and connected to the passage so as to be connected to the inflow chamber.