SUN HYDRAULICS
RPISKWN

***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 RPISKWN (Material Number: RPISKWN) is a pilot-operated, balanced poppet relief cartridge valve designed to regulate pressure by opening to tank port 2 when the inlet port 1 pressure reaches the valve setting. This normally closed pressure regulating valve ensures accurate, smooth, and quiet operation with fast response times and low-pressure rise versus flow. It is immune to cavitation-related noise and manifold erosion due to its internal modulating design. The RPISKWN can handle maximum pressure at port 2, making it suitable for cross-port relief circuits and load-holding applications. The valve remains relatively unaffected by varying oil temperatures and contamination, thanks to its main stage orifice protected by a 150-micron stainless steel screen. The RPISKWN's back pressure on tank port 2 is directly additive to the valve setting at a 1:1 ratio. The W and Y controls allow for full-range adjustability unless a special setting is specified, in which case it represents the maximum setting of the valve. Corrosion-resistant versions are available with stainless steel or zinc-nickel plated external components, identified by model code suffixes AP or LH. This design incorporates Sun's floating style construction to prevent internal part binding due to excessive installation torque or machining variations. With a capacity of up to 100 gpm (380 L/min) and a maximum operating pressure of 5000 psi (350 bar), this valve features a typical response time of 7 ms and minimal leakage at reseat conditions. Installation requires specific torque settings for optimal performance, including adjustment screw internal hex size of 5/32 in., locknut hex size of 9/16 in., and installation torque between 150-160 lbf ft (203-217 Nm). The model weighs approximately 1.25 lb (0.60 kg) and uses Viton seal kits for durability in various applications.