Switch valve introduction
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Switching valve (forced valve) is mounted on the switching heat exchanger (or regenerator) the hot end of the pneumatic switch valve. Switching valve switch is controlled by the signal from the solenoid valve to the compressed air. According to the role played in the process of different air, nitrogen and nitrogen switching valve, pure nitrogen suppression valve, sewage nitrogen three-way valve. From the structure type points, there are two vertical and horizontal. Vertical switching valve can be divided into gas-open and gas-closed two. Open air refers to the signal compressed air out of breath, the valve can rely on self-weight to open automatically; the other hand, the gas-enclosed. Gas open, gas closed the choice of the safety of the device to determine. Nitrogen gas switching valve open, air switch valve closed with gas. As the switch valve action is controlled by the solenoid valve, in addition to pay attention to choose the gas open, gas-closed to prevent gas source hazards, but also pay attention to the state of the solenoid valve with the switching valve state, so that the power supply Failure does not endanger the safety of equipment. Now as follows: 1, sewage nitrogen switching valve. When the four-way solenoid valve is energized, the switching valve is closed. Loss of power, switch valve open. And when the power loss, the gas source pressure, but also by weight to open. In order to ensure that failure occurs, the upper gas through the cold accumulator vent, will not cause overpressure. 2, air switch valve. When the four-way solenoid valve is energized, the switching valve opens. Switch off valve when power is lost. When the power failure control power failure, the switching valve is closed; when the loss of control gas source pressure loss, the switching valve by gravity closed to ensure that the failure of raw air does not enter the air separation tower. 3, sewage nitrogen (pure nitrogen) three-way switch valve. Four-way solenoid valve with electricity, three-way switch valve in the delivery position; four-way solenoid valve power loss, three-way switch valve in a vacant position. When the power failure power failure, the three-way switch valve in the vent position; when the gas source pressure loss, the three-way switch valve by weight in a vacant position.