SUN HYDRAULICS
SCIACEV

***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 SCIACEV (SCIACEV) is a direct-acting sequence valve with an integrated reverse flow check, designed to manage secondary circuit flow once the inlet port pressure surpasses the valve setting. It features an integral check valve allowing reverse flow from port 2 to port 1. The pressure setting controls the pressure at port 1 relative to the drain port 3, and all three-port sequence cartridges are interchangeable within the same frame size. Despite being a zero pilot flow valve, port 3 must be connected for accurate pressure referencing; blocking it will lead to malfunction due to seal weepage. The pressure at port 3 adds directly to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar). This valve is suitable for load holding applications and uses EPDM seals for phosphate ester fluid systems, avoiding petroleum-based fluids that could damage seals. It incorporates Sun's floating style construction to prevent internal binding from installation torque or machining variations. The SCIACEV's cavity is T-19A, Series 4, with a capacity of up to 120 gpm (480 L/min), factory pressure settings established at 2 in/min (30 cc/min), and a maximum operating pressure of 5000 psi (350 bar). Its typical response time is around 2 ms with maximum leakage upon reseat of up to 10 drops/min (0.7 cc/min). The check cracking pressure is set at 25 psi (1.7 bar), and adjustment involves five clockwise turns to increase settings. Installation requires a torque of between 350 - 375 lbf ft (474 - 508 Nm) with specific hex sizes for various components like adjustment screws and locknuts. The model weighs approximately 3.10 lb (1.40 kg) and uses Viton seal kits under part number: 990019006 for maintenance or replacement needs.