A valve system for controlling a corrosive process liquid flow, while avoiding corrosion due to a liquid/vapor interface of the process liquid, causes the process liquid to flow from the valve through a purge port into a vertical segment of a purge line. During valve initialization, a non-reactive gas backpressure within the purge line is controlled to establish the liquid/vapor interface at a desired height within the vertical segment, as determined by an interface level sensor, which can be ultrasonic. The vertical segment is constructed from, or lined with, a material that can withstand contact with the liquid/vapor interface. During valve operation, the non-reactive gas pressure can continue to be regulated, or a purge valve can be shut, trapping a fixed quantity of the non-reactive gas within the purge line. The valve can include a heater configured to prevent a molten process liquid from solidifying within the valve.

A first relief valve chamber (3) of a main relief valve (10) and a second relief valve chamber (7) of an auxiliary relief valve (11) are provided in series in a valve case 1. The first relief valve chamber (3) includes a valve seat chamber (4) at the right and a valve chamber (5) at the left. A first valve member (30) in the valve chamber (5) is biased toward a valve seat member (18) in the valve seat chamber (4) by a first relief spring (40). A second valve member (48) in the second relief valve chamber (7) is biased toward a second valve seat (47) by a second relief spring (50).

An aircraft gas transport system including a high pressure gas supply line having a supply valve, and an equilibrium gas line joined at junctions with the high pressure gas supply line upstream and downstream from the supply valve, and in flow communication with the high pressure gas supply line, the equilibrium gas line having an equilibrium valve and a flow restrictor, the equilibrium valve having an exit orifice and the flow restrictor being offset from the exit orifice of the equilibrium valve.

The present invention discloses a valve structure with a built-in valve seat of a pre-action warning valve, including: a valve body, a valve cap, a valve seat, and a membrane clack. The pre-action warning valve provided in the present invention has the advantages of being simple, reliable, and low in manufacturing costs.

A valve having a high valve opening adjustment accuracy includes: a valve housing provided with an inlet port and an outlet port; a valve body driven by a drive source; a valve seat on which the valve body sits; a spring configured to urge the valve body in a direction opposite to a driving direction by the drive source; and a communication configured to communicate the inlet port with a back surface side space of the valve body.

The present invention discloses a valve structure with a built-in valve seat of a pre-action warning valve, including: a valve body, a valve cap, a valve seat, and a membrane clack. The pre-action warning valve provided in the present invention has the advantages of being simple, reliable, and low in manufacturing costs.

The device includes a main valve, first and second auxiliary valves, a valve body and a filter. The main, which has first and second auxiliary valves are mounted on the valve body, which has an air inlet, a cylinder port and an air discharging port. The air inlet is in communication with the main valve through a first air passage, the cylinder port is sequentially in communication with the first and second auxiliary valves, and the main valve through a second air passage. The air discharging port is sequentially in communication with the first and second auxiliary valves and the main valve through a third air passage. The main and the second auxiliary valves are solenoid valves, and the first auxiliary valve is a hand-operated valve. An air outlet of the filter is in communication with the air inlet. The filter is used for filtering out impurities in gas.

A buffer valve is installed on a pneumatic diaphragm valve. An inner flow channel of the buffer valve includes an inner micro gas hole, an inner chamber, an outer gas hole, and a floating ball. The buffer valve has functions with a high-filling action, a shielding action, a releasing action, a shielding time Δt, and an adjusting mechanism. When inflatable, the floating ball will not block the inner micro hole to be quickly filled with high-pressure gas. when gas discharge, the floating ball will move to the outer gas hole with the gas flow and produce the shielding action to reduce the discharge rate to reduce the vibration and slow down the approach speed of the diaphragm to reduce the impact against the valve seat. When the pressure of the gas decreases, the floating ball is separated from the outer gas hole by the releasing action to accelerate the discharge.

A valve system for controlling a corrosive process liquid flow, while avoiding corrosion due to a liquid/vapor interface of the process liquid, causes the process liquid to flow from the valve through a purge port into a vertical segment of a purge line. During valve initialization, a non-reactive gas backpressure within the purge line is controlled to establish the liquid/vapor interface at a desired height within the vertical segment, as determined by an interface level sensor, which can be ultrasonic. The vertical segment is constructed from, or lined with, a material that can withstand contact with the liquid/vapor interface. During valve operation, the non-reactive gas pressure can continue to be regulated, or a purge valve can be shut, trapping a fixed quantity of the non-reactive gas within the purge line. The valve can include a heater configured to prevent a molten process liquid from solidifying within the valve.

A buffer valve is installed on a pneumatic diaphragm valve. An inner flow channel of the buffer valve includes an inner micro gas hole, an inner chamber, an outer gas hole, and a floating ball. The buffer valve has functions with a high-filling action, a shielding action, a releasing action, a shielding time Δt, and an adjusting mechanism. When inflatable, the floating ball will not block the inner micro hole to be quickly filled with high-pressure gas. when gas discharge, the floating ball will move to the outer gas hole with the gas flow and produce the shielding action to reduce the discharge rate to reduce the vibration and slow down the approach speed of the diaphragm to reduce the impact against the valve seat. When the pressure of the gas decreases, the floating ball is separated from the outer gas hole by the releasing action to accelerate the discharge.