SUN HYDRAULICS
RSHCKDN

***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 RSHCKDN (RSHCKDN) is a pilot-operated, balanced piston sequence valve designed to supply a secondary circuit with flow once the inlet port 1 pressure surpasses the valve setting. This valve effectively manages pressure at port 1 in relation to the drain port 3, remaining unaffected by back pressure at port 2 up to the set threshold. It can substitute for two-port relief valves when there's return line pressure. The RSHCKDN features interchangeable three-port sequence cartridges, ensuring compatibility across frame sizes with identical flow paths and cavities. Its main stage orifice is safeguarded by a 150-micron stainless steel screen, and it supports a maximum operating pressure of 5000 psi (350 bar). Notably, this valve is unsuitable for load-holding applications due to spool leakage. The design incorporates Sun's floating style construction to minimize internal binding risks from excessive installation torque or machining variations. It allows adjustment throughout its range using W or Y controls unless a special setting is specified, which then represents the maximum setting. The valve exhibits a response time of approximately 10 ms and has specific installation requirements: a hex size of 1\u00bc inches (31.8 mm) and an installation torque of 150\u2013160 lbf\u00b7ft (203\u2013217 Nm). It also features an adjustment screw internal hex size of 5/32 inches (4 mm) and a locknut torque of 80\u201390 lbf\u00b7in (9\u201310 Nm). The RSHCKDN's capacity reaches up to 60 gpm (240 L/min), with factory settings established at 4 gpm (15 L/min). Additionally, it offers minimal leakage rates and includes Viton seal kits for enhanced durability.