Block for inflatable butterfly valve-seats

The HAFNER CBE / CBN control blocks are designed for butterfly valves with inflatable valve-seat.











The block comes with a 1/4" NAMUR-interface towards the actuator as well as towards the pilot-valve and a G 1/8" threaded port to connect with the port of the inflatable valve-seat. If the block is required with G 1/4“ threaded ports, plate GPN 1/4 can be added instead of a NAMUR-valve.

Opening- and closing time delay can be adjusted independently but they are related to the operating pressure. At 6 bar time-delay can be adjusted between 0 and 2 seconds.

If a pressure regulator is used between the CBE /CBN and the inflatable valve-seat, an additional quick exhaust valve is needed to exhaust the seal.

 

Exemplary set-up:

Block for single-acting actuators: type CBE 700 K (EB)

The control-block has to receive its signals to open and close from a 5/2-way NAMUR-valve.

Please note that it does not work with a 3/2-way valve.

The block can only be used for spring-close applications. Air is used to open the actuator; spring is closing it.

The spring-chamber won’t be pressurized during the closing movement. The block does not offer the exhaust-air recirculation (purge) of the spring-chamber.

The block also offers a fail-close function. If the electricity and/or air signal cuts-off the actuator will close by the force of the springs. However, in case the air is away the valve-seat won’t be pressurised.

Type CBE 700 K EB with additional port X: pressurizing of the inflatable seal does not start before a pneumatic signal is received.

Download datasheet here.

Block for double-acting actuators: type CBN 700 K (EB)

The control-block receives it‘s signals to open and close from a 5/2-way NAMUR-valve.

The closing-signal is fed through to the actuator, the seal is inflated with time-delay. When the process-valves is to be opened first the seal is deflated, with time-delay the actuator opens the process-valve.

Type CBN 700 K EB with additional port X: pressurizing of the inflatable seal does not start before a pneumatic signal is received.

Download datasheet here.

 If you are interested in our control blocks, please do not hesitate to contact us.