Hafner is offering one of the widest ranges of accessories for smart valve automation–controlled by an electro-pneumatic positioners. Products include:
Type HVRZN 731 701 function:
5/2-way valve to override a positioner. By switching the hand lever, the actuator can be fully opened or closed.
Type HVRZN 731 702 function:
5/3-way valve to override a positioner. Supply ports from positioner can be cut-off by pulling the knob. By switching the hand lever, the actuator can be fully opened, fully closed or put into intermediate position.
Both hand-lever valves offer a safety lever that needs to be pulled. Unintended actuation is avoided securely.
Pneumatic pressure switches: By turning the hand-wheel the required minimum actuation pressure can be set between 3 and 6 bar. If pressure drops below set point, the valve is pneumatically locking the actuator. Actuator remains in current position (Fail-in Place). Type P 311 501 SR for single-acting actuators and Type P 411 701 SR for double-acting actuators.
Pressure applied holding valve – pneumatic version (type DSVN 5): In case air pressure cuts-off, valve is blocking the actuator. Actuators remains in current position (Fail-in Place).
Pressure applied holding valve –electro-pneumatic version: In the case where air pressure and/or electric signal at the solenoid coil cuts off, the valve is blocking the actuator. Actuator remains in current position (fail-in place).
Hafner Pneumatik
www.hafner-pneumatik.com
Filed Under: Pneumatic Tips