SUN HYDRAULICS
RSHCKEV

***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 RSHCKEV (RSHCKEV) is a pilot-operated, balanced piston sequence valve designed to supply a secondary circuit with flow once the pressure at inlet port 1 exceeds the valve setting. This valve regulates pressure at port 1 relative to the drain port 3, remaining insensitive to back pressure at port 2 up to the valve's setting. It can replace two-port relief valves if there is pressure in the return line. The RSHCKEV features interchangeable three-port sequence cartridges, ensuring consistent flow paths and cavity compatibility for a given frame size. As pressure at port 1 increases relative to port 3, pilot flow also rises above the valve setting. The main stage orifice is safeguarded by a 150-micron stainless steel screen, and pressure at port 3 adds directly to the valve setting in a 1:1 ratio, not exceeding 5000 psi (350 bar). This model is not suitable for load-holding applications due to spool leakage but offers adjustment options with W and Y controls for full-range or special settings. Sun's floating style construction minimizes internal part binding from excessive installation torque or machining variations. With a cavity type of T-17A Series 3 and capacity of up to 60 gpm (240 L/min), it operates under maximum pressures of 5000 psi (350 bar). Control pilot flow ranges between 15-20 in\u00b3/min (0.25-0.33 L/min), with typical response times around 10 ms. The RSHCKEV has specific installation requirements: hex size of 1\u00bc inches (31.8 mm), installation torque between 150-160 lbf\u00b7ft (203-217 Nm), internal hex adjustment screw size of ^5/32 inches (4 mm), and locknut torque between 80-90 lbf\u00b7in (9-10 Nm). It weighs approximately 1.50 lbs (0.70 kg) and uses Viton seal kits for optimal performance in hydraulic systems.