SUN HYDRAULICS
RSHCYDN

***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 RSHCYDN (RSHCYDN) 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 is engineered to control the pressure at port 1 relative to the drain port 3 and remains insensitive to back pressure at port 2 up to the valve setting. It can be used as an alternative to 2-port relief valves when there is pressure in the return line. Notably, all three-port sequence cartridges are interchangeable in terms of flow path and cavity size for a given frame size. As the pressure at port 1 increases relative to port 3, pilot flow continues to rise 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, with a maximum limit of 5000 psi (350 bar). This model is not suitable for load holding applications due to spool leakage. The RSHCYDN incorporates Sun's floating style construction, minimizing internal part binding caused by excessive installation torque or machining variations. It features a T-17A cavity, Series 3 capacity of up to 60 gpm (240 L/min), and factory pressure settings established at 4 gpm (15 L/min). The maximum operating pressure reaches up to 5000 psi (350 bar), with control pilot flow between 15-20 in\u00b3/min (0.25-0.33 L/min) and typical response time of approximately 10 ms. Maximum valve leakage at specified conditions is limited to four in\u00b3/min (65 cc/min). The adjustment mechanism allows for five clockwise turns for increased settings, with specific hex sizes and torque specifications provided for installation and adjustment components. This model weighs approximately 1.50 lb (0.70 kg) and includes options for Viton seal kits under part number 990017006.