SUN HYDRAULICS
RSHSCNN

***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 RSHSCNN (RSHSCNN) is a pilot-operated, balanced poppet sequence valve designed to supply a secondary circuit with flow once the inlet port 1 pressure exceeds the valve setting. This sequence valve regulates pressure at port 1 relative to the drain port 3, remaining unaffected by back pressure at port 2 up to the valve setting. It can replace two-port relief valves in systems with return line pressure and is suitable for load holding applications. The design ensures that all three-port sequence cartridges are interchangeable, sharing the same flow path and cavity for a given frame size. As inlet pressure rises above the valve setting, pilot flow increases, with the main stage orifice protected by a 150-micron stainless steel screen. The maximum allowable pressure at port 3 should not exceed 5000 psi (350 bar), which is directly additive to the valve setting at a 1:1 ratio. The RSHSCNN model features Sun's floating style construction to prevent internal binding due to excessive installation torque or machining variations. It accepts maximum pressure at port 2, making it suitable for cross-port relief circuits. With a response time of approximately 10 ms and a factory pressure setting established at 4 gpm (15 L/min), this valve has a capacity of up to 60 gpm (240 L/min) and can operate under pressures up to 5000 psi (350 bar). The maximum valve leakage upon reseat is minimal, measured at just ten drops per minute (0.7 cc/min). Installation specifications include a hex size of 1-1/4 inches (31.8 mm) with an installation torque between 150-160 lbf ft (203-217 Nm). The adjustment screw has an internal hex size of 5/32 inches (4 mm), while the locknut requires a torque of 80-90 lbf in (9-10 Nm). The model weighs approximately 1.50 lb (0.70 kg) and utilizes Viton seals in its cartridge design.