A 3-way hydraulic valve comprising a body formed with an inlet port for connecting to a pressurized supply line, a first outlet port for connecting to an outlet line and being in flow communication with the inlet port, a gate intermediate the inlet port and the first outlet port, dividing the body into an inlet chamber and an outlet chamber, the body further comprises a second outlet extending from the outlet chamber, and a control chamber fitted with a deformable diaphragm sealingly engageable with the gate so as to prevent flow between the inlet port and the first outlet port, and a sealing port associated with the second outlet and comprising a sealing member linearly displaceable between a closed and an open position. The sealing member is attached to the diaphragm by a linking element having at least two degrees of freedom, whereby when the diaphragm engages the gate, the sealing port is opened and when the diaphragm disengages from the gate the sealing port is closed and disengagement of the diaphragm from the gate entails closing of the sealing port by the sealing member.