Hand Lever Valves are used to operate Pneumatic Cylinders. In the absence of electrical supply, manually operated valves such as Hand Lever Valves are used. The functioning is the same, however, the solenoid coil is replaced by a hand lever, which controls the movement of the spool inside the valve, thereby allowing the air to pass.
In a direct acting solenoid valve, a coil magnetically opens the valve in a direct action, lifting the shaft and the seat of the valve without depending on outside pressure.
Roller Lever Valves are used to actuate the movement of Pneumatic Cylinders. In the absence of electrical supply, manually operated valves such as Roller Lever Valves are used. The functioning is the same, however, the solenoid coil is replaced by a Rolling lever, which actuates the movement of air inside the valve, and out to the Cylinder.
Each of the two ports on a two-way valve is alternately used to permit flow as well as close it off. A two-way valve can be specified to be either “normally open" or “normally closed” in its operation. With a normally open valve, the valve remains open until some type of current is applied to close the valve. Suspension of the electrical power causes the valve to automatically reopen to its normal state. A normally closed solenoid valve is the most common, working in the opposite fashion, remaining closed until a power source causes it to open