C04V3, Pilot Operated, Spool-Type with Relieving

Features

• Maximum pressure setting up to 350 bar.
• Low pressure rise/flow characteristic
• Spool valve for good stability
• Partial reverse flow capability
• Hardened working parts for maximum durability

Operation

The adjustable spring-loaded ball in the pilot section is shifted at valve setting by the regulated outlet pressure sensed through an orifice in the main spool from port [3]. The resulting pilot flow creates a pressure drop across the spring-loaded main spool that then meters the supply flow from port [2], maintaining the regulated pressure on port [3]. An increase in the regulated pressure causes the spool to lift further and acts as a service line relief valve, closing the supply port [2] and then relieving to port [1]. Ports [2] and [3] remain normally open when port [3] pressure is below the valve setting.

Back pressure on port [1] adds to the valve setting.

Application note

• Drain line should be piped directly to the tank. Any back pressure in the drain line will be additive to the regulated pressure.