In order to operate a valve equipped with a Netherlocks interlock from a locked-open to a locked-closed position, you first need the ‘open’ key for that particular valve interlock. The ‘open’ key code is hard dye stamped into the key, as well as the right-hand front side of the lock body. The key insert position is shown on the sticker on the right-hand side of the interlock. To unlock the valve from its open position, the key has to be inserted into the interlock’s right-hand key insert position. When this has been done, the operator is able to operate the valve by turning the hand wheel or sliding lever to the closed position. When using double-key valve interlocks, the ‘close’ key has to be removed from the left-hand side of the interlock to lock the valve in its closed position. The valve will already be locked closed before the ‘close’ key is completely removed. Once the key has been removed, the operator will be able to operate the next valve in the sequence. If the released key is the final key in the sequence, it should be returned to the key cabinet.
From locked closed to locked open
In order to operate a valve from a locked-closed to a locked-open position, the ‘close’ key applicable to that particular valve interlock is needed. The close key code is hard dye stamped into the key, as well as the left-hand front side of the lock body. The key insert position is indicated on the sticker on the left-hand side of the interlock. To unlock the valve from its open position, the key has to be inserted into the interlock’s left-hand key insert position. When this has been done, the operator is able to operate the valve by turning the hand wheel or sliding lever to the open position. When using double-key valve interlocks, the ‘open’ key has to be removed from the right-hand side of the interlock to lock the valve in its open position. The valve will already be locked open before the ‘open’ key is completely removed. Once the key has been removed, the operator will be able to operate the next valve in the sequence. If the released key is the final key in the sequence, it should be returned to the key cabinet.