SUN HYDRAULICS
SCIACEN

***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 SCIACEN (Material Number: SCIACEN) 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 component also features an integral check valve enabling reverse flow from port 2 to port 1. The sequence valve's pressure setting manages the 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 for a given frame size. Despite being a zero pilot flow valve, connecting port 3 is essential to maintain a pressure reference in the control chamber, as blocking it can lead to malfunction due to reciprocating 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 SCIACEN model is suitable for load-holding applications and utilizes EPDM seals compatible with phosphate ester fluids, though exposure to petroleum-based substances will damage these seals. The cartridge employs Sun's floating style construction, minimizing internal part binding due to installation torque or machining variations. Key specifications include a cavity T-19A series with a capacity of 120 gpm (480 L/min), factory pressure settings established at 2 in/min (30 cc/min), and maximum operating pressure of 5000 psi (350 bar). The typical response time is approximately 2 ms, and maximum valve leakage at reseat is limited to 10 drops/min (0.7 cc/min). The check cracking pressure stands at 25 psi (1.7 bar), while adjustment requires up to five clockwise turns for increased settings. Installation torque ranges between 350-375 lbf ft (474-508 Nm), with adjustment screw and locknut hex sizes specified for precise assembly.