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LKB Butterfly Valve


LKB is a sanitary automatically or manually operated butterfly valve for use in stainless steel pipe systems.

Working principle

LKB is either remote-controlled by means of an actuator or manually operated by means of a handle. The actuator is made in three standard versions, normally closed (NC), normally open (NO) and air/air activated (A/A).

The actuator is designed so that an axial movement of a piston is transformed into a 90° rotation of a shaft. The torque of the actuator is increased when the valve disc contacts the seal ring of the butterfly valve.

The handle for manual operation mechanically locks the valve in its open or closed position. The handles for the valve sizes DN125 and DN150, which are designed for locking in two intermediate positions, enable adjusting of the valve, so that the flow rate can be regulated


How it works

Operating principle

The Unique Control LKB uses an air spring, which enables the unit to be operated at a significantly lower air pressure compared to control units using a conventional mechanical spring. This reduces wear thereby eliminating the need for maintenance.

When air enters the Unique Control LKB, the built-in solenoid valve diverts the flow either above or below the piston. The helix inside the piston transfers the vertical movement into a rotation ensuring smooth valve operation. The design enables the Unique Control LKB to operate at an air pressure of only 3 bar.

Integrated air surveillance system

A built-in pressure sensor monitors the air supply. In the event of a critical drop in air pressure, the actuator sends a warning signal, but continues to operate. In the event that the supply of air is cut off, the actuator also sends a warning signal, maintains its position and continues to operate after resolving the problem. Switching from NC to NO Changing the normally closed contact to normally open position is easy. Simply open the top cover, loosen the screws, lift up and rotate the top 180°, then re-assemble it.



Communication interface: AS-interface v.2.1, 31 nodes; AS-interface v.3.0, 62 nodes; and digital interface.

Bracket kit: 1″ to 4″ and DN 25 – DN 100:

Bracket sizes: DN25-50, DN65, DN80 and DN100

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