SUN HYDRAULICS
SCIACDV

***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 SCIACDV (SCIACDV) is a direct-acting sequence valve with a reverse flow check, designed to supply a secondary circuit with flow once the inlet port pressure exceeds the valve setting. It features an integral check valve that allows reverse flow from port 2 to port 1. This sequence valve manages 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. Although it is a zero pilot flow valve, connecting port 3 is essential for maintaining pressure reference in the control chamber; blocking it may 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 allowable pressure of 5000 psi (350 bar). This product is suitable for load-holding applications and uses EPDM seals for systems with phosphate ester fluids, as petroleum-based fluids can damage these seals. The Sun floating style construction minimizes internal part binding due to excessive torque or machining variations. Key specifications include: Cavity T-19A, Series 4, capacity of 120 gpm (480 L/min), factory pressure settings established at 2 in/min (30 cc/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). Adjustment requires up to five turns clockwise to increase settings, with specific torque values for installation and locknut adjustments provided. The model weighs approximately 3.10 lb (1.40 kg) and includes Viton seal kit options for maintenance and compatibility considerations.