SUN HYDRAULICS
SCIACAV

***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 SCIACAV (Material Number: SCIACAV) is a direct-acting sequence valve designed to supply a secondary circuit with flow once the inlet port 1 pressure exceeds the valve setting. It features an integral check valve that allows reverse flow from port 2 to port 1. The sequence valve's pressure setting controls 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 size. Despite being a zero pilot flow valve, it requires port 3 to be connected for maintaining a pressure reference in the control chamber; otherwise, blocking it can lead to malfunction due to reciprocating seal weepage. The pressure at port 3 should not surpass 5000 psi and is directly additive to the valve setting at a ratio of 1:1. This product is suitable for load holding applications and uses EPDM seals for systems with phosphate ester fluids, avoiding exposure to petroleum-based fluids which can damage the seals. The Sun floating style construction minimizes internal part binding risks due to excessive installation torque or machining variations. The SCIACAV model has a capacity of up to 120 gpm (480 L/min) and operates at a maximum pressure of 5000 psi (350 bar). It features typical response times of about 2 ms, and a maximum valve leakage rate of approximately 10 drops/min upon reseat. The check cracking pressure is set at 25 psi (1.7 bar), with five clockwise turns needed to increase settings. Its installation torque ranges from 350 - 375 lbf ft (474 - 508 Nm), and it weighs around 3.10 lb (1.40 kg). For maintenance or replacement, Viton seal kits are available under part number: 990019006.