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Valve interlocks are used everywhere where a sequence of valves helps protect personnel and machinery.
These are mainly:
◦offshore applications,
◦chemical plants and refineries,
◦or the gas industry
◦as well as electricity and water suppliers.
Valves have a very important safety function in many industrial processes.
An operating error at a valve can have dramatic consequences – personal injuries, damages to the plant, or even contamination of the environment can be a result. Thus, the safe operation of valves must be guaranteed.
 By using the Haake Safety Valve interlocks you can be sure the correct sequence of operating procedures will always be adhered to.
Haake products can be installed at every lever-operated or hand-wheel valve, without damaging the mounting. The interlocks are robust, easily handled and clearly show every position of the valve (tOPen).
Before the installation of Haake Safety Valve interlock systems, the requirements and conditions of the operation are established in co-operation with our users / customers.
Valve interlocks can only be used when both keys are inserted in the interlock. Both keys are individually coded. A key with the wrong coding cannot be inserted in the interlock respectively cannot open this. Each key can only be removed when the valve is in a certain position. Once one key has been removed, the other one is trapped in the interlock.
Interlocking systems for lever-operated valves are distinguished by the fact that the position of the removed keys corresponds with the final position. This guarantees the removal of one key only when the valve is fully open and the removal of the other key only when the valve is fully closed. Interlocking systems for hand-wheel operated valves are used for different applications. With these systems the final position can generally be adjusted. Often the final position is selected as “Valve fully open” and “Valve fully closed”. But other valve positions are also possible. For this, there is one key/lock for every final position. A key can only be removed from the defined final position.
◦Usable in aggressive surroundings
◦Manufactured in stainless steel AISI 316L (1.4401)
◦High degree of safety through unique shaping and individual coding of keys
◦Keys can be inserted in various ways
◦Condition of valve is distinguished by position of key (tOpen)
◦Removal of key in direction of lock enables further usage
◦Existing hand wheel can be re-used in most applications
◦„Anti tamper“ fixings available to avoid unauthorized operation of valves
◦No padlocks which could be removed easily
◦Safety coded keys, which cannot be copied readily
◦No chains to complicate operation