SUN HYDRAULICS
SCIACWN

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Sun Hydraulics directly.***
The Sun Hydraulics SCIACWN (Material Number: SCIACWN) is a direct-acting sequence valve with an integrated reverse flow check, designed to supply a secondary circuit with flow once the inlet port 1 pressure exceeds the valve setting. This valve includes a check valve that allows reverse flow from port 2 back to port 1. It controls pressure at port 1 relative to the drain port 3, and all three-port sequence cartridges are interchangeable in terms of flow path and cavity size. Despite being a zero pilot flow valve, it requires connection to port 3 for proper pressure reference; blocking this port can cause malfunction due to seal weepage. The pressure at port 3 adds directly to the valve setting at a 1:1 ratio, with a maximum of 5000 psi (350 bar). The SCIACWN is suitable for load-holding applications and features EPDM seals for use with phosphate ester fluids only, as petroleum-based fluids will damage these seals. Its floating style construction minimizes internal binding risks due to excessive installation torque or machining variations. Key specifications include a capacity of 120 gpm (480 L/min), maximum operating pressure of 5000 psi (350 bar), typical response time of 2 ms, and maximum valve leakage at reseat of 10 drops/min (0.7 cc/min). The check cracking pressure is set at 25 psi (1.7 bar), and adjustments are made via clockwise turns, with specific torque requirements for installation and locking components. The model weighs approximately 3.10 lb (1.40 kg) and is compatible with Viton seal kits like the cartridge version: 990019006.