A flow direction restriction valve mechanism unit includes a pressure decreasing valve assembly that is located to freely advance or retract in a combination valve cassette attached to an in-outlet secondary side flow path formed on the side of an outlet with respect to an intermediate transmission member in a flow path, and retracts by a pressure of gas; a first coil spring urging the pressure decreasing valve assembly in a retracting direction; a check valve that is located to be freely advance or retract with respect to the pressure decreasing valve assembly, and retracts by a pressure of the gas; and a second coil spring urging the check valve in an advancing direction. A gas induction passage is formed in which the gas flows and acts on the pressure decreasing valve assembly such that the pressure decreasing valve assembly moves in the advancing direction.

A pressure reducing valve includes: a housing having an input port, an input channel connected to the input port, a pressure reducing chamber connected to the input channel, a delivery channel connected to the pressure reducing chamber, an output channel and an auxiliary channel branched off from the delivery channel, an output port connected to the output channel, and an auxiliary port connected to the auxiliary channel; and a valve mechanism which is provided inside the pressure reducing chamber connected to the delivery channel and of which the amount of opening is changed to regulate the pressure inside the pressure reducing chamber. Centerlines of the delivery channel, the output channel, and the auxiliary channel are arranged in the same plane.

A valve is provided having first and second flow channels connected by a passage. A sealing device is operable to open and close the passage to control fluid flow between the first and second flow channels. The sealing device includes a first sealing body and a second sealing body through which the passages extends. The first and second sealing bodies are biased together by a spring to close the passage. The first sealing body is passively movable by fluid and actively movable by an electromagnetic device to open the passage to permit fluid to flow between the first and second passages.

An air pressure control device includes first and second housings, a diaphragm partitioning an inner space of the housings into a first air chamber (one air chamber) and a second air chamber (the other air chamber), a valve seat supported by the diaphragm, a valve member arranged in the first air chamber and closing or opening a through-hole in the valve seat, a pressure adjusting mechanism (including a pressure adjusting bolt and an upper seat) that adjusts a force applied to the diaphragm from a side including the second air chamber, and a main spring (compression coil spring) disposed in the second air chamber and applying a spring force to a lower seat (spring receiving member) disposed on the valve seat. A bearing is interposed between the valve seat and the lower seat.

A pressure reducing valve includes: a housing having an input port, an input channel connected to the input port, a pressure reducing chamber connected to the input channel, a delivery channel connected to the pressure reducing chamber, an output channel and an auxiliary channel branched off from the delivery channel, an output port connected to the output channel, and an auxiliary port connected to the auxiliary channel; and a valve mechanism which is provided inside the pressure reducing chamber connected to the delivery channel and of which the amount of opening is changed to regulate the pressure inside the pressure reducing chamber. Centerlines of the delivery channel, the output channel, and the auxiliary channel are arranged in the same plane.

A valve is provided having first and second flow channels connected by a passage. A sealing device is operable to open and close the passage to control fluid flow between the first and second flow channels. The sealing device includes a first sealing body and a second sealing body through which the passages extends. The first and second sealing bodies are biased together by a spring to close the passage. The first sealing body is passively movable by fluid and actively movable by an electromagnetic device to open the passage to permit fluid to flow between the first and second passages.

The present invention relates to a safe valve for a high pressure regulator, which includes: a guide body coupled to a valve port prepared at a body of a high pressure regulator; a valve body couple to an upper end part of the guide body to open the valve port when the overpressure occurs in a state that the valve port is closed; a lower spring installed inside the valve body for providing elastic force to the valve body; and a discharging pipe couple to a lower part of the guide body for discharging the fuel upon an opening operation of the valve body, wherein a function for a relief valve to relieve the overpressure by discharging the fuel when the overpressure is generated inside the high pressure regulator and a function for a purge valve separated from the body to discharge fuel inside the high pressure regulator are integrally provided.

Relevant specifications in the field of gas supply provide for different safety devices for installation in a gas-supply system, in particular, an acetylene-supply system. To provide such a safety device, which is characterized by a compact structure and a high level of operational reliability, this invention proposes that a valve body (1) incorporates an over-pressure valve (4; 104) of a quick-action shut-off device, a control valve (3; 103) of a pressure-limiting device, and a safety valve (2; 102), whereby the safety valve (2; 102) can be fluidically connected to the over-pressure valve (4; 104) and the control valve (3; 103), and closes either when the over-pressure valve (4; 104) opens due to an inlet pressure that is above the inlet-pressure limit value or when the control valve (3; 103) opens due to an outlet pressure that is above an outlet-pressure limit value.

An air pressure control device includes first and second housings, a diaphragm partitioning an inner space of the housings into a first air chamber (one air chamber) and a second air chamber (the other air chamber), a valve seat supported by the diaphragm, a valve member arranged in the first air chamber and closing or opening a through-hole in the valve seat, a pressure adjusting mechanism (including a pressure adjusting bolt and an upper seat) that adjusts a force applied to the diaphragm from a side including the second air chamber, and a main spring (compression coil spring) disposed in the second air chamber and applying a spring force to a lower seat (spring receiving member) disposed on the valve seat. A bearing is interposed between the valve seat and the lower seat.

The present invention relates to a safe valve for a high pressure regulator, which includes: a guide body coupled to a valve port prepared at a body of a high pressure regulator; a valve body couple to an upper end part of the guide body to open the valve port when the overpressure occurs in a state that the valve port is closed; a lower spring installed inside the valve body for providing elastic force to the valve body; and a discharging pipe couple to a lower part of the guide body for discharging the fuel upon an opening operation of the valve body, wherein a function for a relief valve to relieve the overpressure by discharging the fuel when the overpressure is generated inside the high pressure regulator and a function for a purge valve separated from the body to discharge fuel inside the high pressure regulator are integrally provided.