Description of protective measures for regulated pneumatic vacuum ball valve

For the adjustable pneumatic vacuum ball valve, the situation is more complicated, so we mainly discuss the three-breaking method of the adjustable pneumatic. In general, when selecting a pneumatic vacuum ball valve, we must first determine whether the gas is selected or closed. This is the protection position when the vacuum ball valve is installed to adjust the actuator. If the valve is open when the process requires gas shutoff, then the normally open Otherwise, it is normally closed. This is only a superficial solution. If the process requires three-break protection of gas-breaking, power-off, and off-signal, the vacuum ball valve needs to be equipped with some accessories to form a protection system to achieve control requirements. These accessories are mainly limited, solenoid valves, etc.
The adjustable pneumatic vacuum ball valve is used in the system. When the control system air source is faulty (gas loss), the self-locking valve is automatically opened, and the control air source of the pneumatic control reversing valve is cancelled. The slide valve of the pneumatic control reversing valve is in the spring. Under the action of resetting, one of the two pneumatically controlled reversing valves, the other intake, the check valve is closed, the gas source is supplied to the valve by the gas source stored in the gas storage tank, thereby realizing the valve Off or fully open. Fully or fully open conversion can be achieved by adjusting the connection of the pneumatically controlled directional control valve.
If you want to achieve valve retention, install a pneumatic retaining valve and change the pipeline connection, use the self-locking valve to directly control the retaining valve, and cancel the pneumatic control reversing valve, check valve, and gas storage tank.
To achieve a gas shut-off source, the valve can be operated several times. Refer to the following scheme.
When the regulating pneumatic vacuum ball valve is in the air source failure, the one-way valve is closed, the blocking valve is out of gas, and the sliding valve of the blocking valve is reset by the action of the spring, the gas path is reversed, and the gas source line of the system is disconnected. Through the gas storage tank pipeline, the gas storage tank supplies air to the valve to ensure that the valve has several movements to achieve continuous control. Since the capacity of the gas storage tank is limited, and the pressure of the gas source in the gas storage tank is continuously decreasing as the valve moves, the gas storage tank cannot be used for gas supply for a long time. The capacity of the gas storage tank used in this scheme should be larger than the capacity of the general protection gas storage tank. When the program is shut off, the number of valve actions is related to the capacity of the gas storage tank.