SOS

The EPTA® SOS (shut-off security) blocking valve is a positive close action valve, that is to say, normally close by the spring and kept in that position by the stream direction. The blocking trigger is formed by a piston or diaphragm and the reset is done manually. The blocking can be high cut-out, low cut-out or high cut-out and low cut-out pressure. The close of the seal is unbalanced.