Pressure maintaining gas cylinder valve

A pressure maintaining gas cylinder valve, comprising:

• a valve body, wherein the valve body is provided with an air inlet, an air outlet, a valve cavity and a gas channel connecting the air inlet and the air outlet;
• the gas channel runs through the valve cavity;
• a valve element and a valve element control mechanism, wherein the valve element is located in the valve cavity and driven by the valve element control mechanism to move in the valve cavity so as to open or close the air inlet;
• a pressure retaining device provided in the gas channel;
• wherein, an axis of the pressure retaining device and that of the valve element are in the same vertical plane;
• the pressure retaining device has a mounting base which is laterally arranged on the gas channel near the air outlet;
• the other end of the gas channel is sealed by a plug;
• a spring and a valve are located in the mounting base, a front section of the valve is near the air outlet to open or close the air outlet, while a rear section of the valve is located in the mounting base and moves laterally along the mounting base;
• the spring is located between the valve and the mounting base to push the valve to close the air outlet;
• wherein the mounting base is a cylinder, a front section of the cylinder is provided with a transverse cavity for accommodating the spring and the valve for lateral movement of the valve;
• a rear section of the cylinder is provided with a longitudinal through hole for the valve element to pass through and achieve longitudinal movement.