Hydrogen pressure-reducing valve having automatic pressure-relief and cut-off functions and method therefor

A hydrogen pressure-reducing valve having automatic pressure-relief and cut-off functions, comprising a main pressure-reducing valve and a cut-off valve, wherein

• the main pressure-reducing valve includes a valve body, an adjustment sealing cover, a top rod, a valve core, and an inlet sealing cover coaxially arranged;
• the valve body is penetratingly disposed with a cavity in an axial direction, and a valve body outlet is disposed on a side wall;
• the adjustment sealing cover is detachably closed and assembled on a top of the valve body, and the inlet sealing cover is detachably closed and assembled at a bottom of the valve body;
• the inlet sealing cover is disposed with an inlet channel, a control channel, and a top part groove communicated sequentially, and the inlet channel is used to connect with an external gas inlet pipe;
• the valve core is installed at a lower part of the cavity of the valve body, with a control tip disposed at a bottom;
• a lower part of the control tip is located in the top part groove of the inlet sealing cover and able to close the control channel;
• a circumferential gap between the control tip and the top part groove is an intermediate channel, and the intermediate channel is able to communicate with the inlet channel through the control channel;
• the valve core is disposed with a first gas channel communicated with the intermediate channel;
• an end of the adjustment sealing cover away from the valve body is coaxially connected to a screw rod, and the screw rod and the adjustment sealing cover are respectively penetratingly disposed in the axial direction with a first hole channel and a second hole channel communicated with each other;
• the top rod is installed on an upper part of the cavity of the valve body, and includes a first disc-shaped end part, a rod part, and a second disc-shaped end part connected sequentially;
• the rod part penetrates the second hole channel and reaches into the first hole channel, and a height of the rod part does not exceed the first hole channel;
• there is an adjustment channel on an upper part of the first hole channel, contact portions between the rod part with respect to the adjustment sealing cover and the screw rod maintain airtightness, and the rod part is able to slide up and down along the first hole channel and the second hole channel;
• there is a second gas channel communicated with the valve body outlet between the adjustment sealing cover and the first disc-shaped end part, the first disc-shaped end part is penetratingly disposed with at least one third gas channel in the axial direction, and the first gas channel communicates with the second gas channel through the third gas channel;
• the first disc-shaped end part is pressed against a top part of the valve core, and the valve core is able to drive the top rod to move vertically up and down along the cavity of the valve body;
• the second disc-shaped end part is located at a lower part of the adjustment channel and is able to move axially along the adjustment channel, and a radial cross-section of the second disc-shaped end part is larger than a cross-section of the control tip;
• and a first spring sleeved on the rod part of the top rod is disposed between the adjustment sealing cover and the first disc-shaped end part, a second spring sleeved external to the valve core is disposed between the inlet sealing cover and the first disc-shaped end part, and the first spring and the second spring remain in a compressed state;
• and
• a top part of the screw rod is connected to the cut-off valve, and the cut-off valve includes a gas flow inlet, a valve rod disposed with a cut-off valve element at an end part, and a gas flow outlet;
• the gas flow inlet is used to connect with the external gas inlet pipe, the gas flow outlet communicates with a top part of the adjustment channel, and a target gas is able to enter the adjustment channel through the gas flow outlet and act on the second disc-shaped end part;
• the valve rod is disposed with a pressure-relief channel, the pressure-relief channel includes a control end and an exhaust end, the exhaust end communicates with an outside world;
• and the control end is able to communicate with a valve body inner cavity of the cut-off valve in response to the cut-off valve element being closed, and the control end is closed in response to the cut-off valve element being opened.