SUN HYDRAULICS
SCIALEV

***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 SCIALEV (Material Number: SCIALEV) is a direct-acting sequence valve equipped with a reverse flow check feature, designed to supply a secondary circuit with flow once the inlet port 1 pressure surpasses the valve setting. This model effectively incorporates an integral check valve to facilitate reverse flow from port 2 to port 1. The sequence valve setting regulates 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, it is crucial that port 3 remains connected to maintain pressure reference in the control chamber; blocking this port can result in malfunction due to reciprocating seal weepage. The pressure at port 3 directly adds to the valve setting at a 1:1 ratio, with an upper limit of 5000 psi (350 bar). This model is particularly suited for load-holding applications and comes with EPDM seals for systems using phosphate ester fluids, as exposure to petroleum-based fluids can damage these seals. It features Sun's floating style construction, minimizing internal part binding risks due to installation torque or machining variations. With a cavity T-19A Series 4 capacity of up to 120 gpm (480 L/min), factory pressure settings are established at 2 in/min (30 cc/min), and it operates efficiently under maximum pressures of up to 5000 psi (350 bar). The typical response time is approximately 2 ms, with maximum valve leakage at reseat being limited to 10 drops/min (0.7 cc/min). The check cracking pressure stands at 25 psi (1.7 bar), and adjustments can be made via clockwise turns on the screw, which has an internal hex size of 5/32 inches (4 mm).