SUN HYDRAULICS
SCIACCV

***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 SCIACCV (Material Number: SCIACCV) 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. This model includes an integral check valve allowing reverse flow from port 2 to port 1. The pressure setting controls the pressure at port 1 relative to drain port 3, which must be connected to maintain proper function. The valve is suitable for load-holding applications and features EPDM seals for systems using phosphate ester fluids, avoiding petroleum-based fluids to prevent seal damage. It employs Sun's floating style construction to reduce internal binding risks due to installation torque or machining variations. The valve fits into a T-19A cavity and has a capacity of up to 120 gpm (480 L/min), with a maximum operating pressure of 5000 psi (350 bar). Typical response time is around 2 ms, and maximum leakage at reseat is approximately 10 drops/min (0.7 cc/min). The check cracking pressure stands at 25 psi (1.7 bar), and the adjustment allows for five full clockwise turns to increase the setting. Installation requires specific torques: valve installation torque between 350 - 375 lbf ft (474 - 508 Nm), adjustment screw internal hex size of 5/32 in. (4 mm), locknut hex size of 9/16 in. (15 mm), and locknut torque between 80 - 90 lbf in. (9 - 10 Nm). The model weighs approximately 3.10 lb (1.40 kg) and comes with an optional Viton seal kit under part number 990019006 for enhanced durability in specific applications.