SUN HYDRAULICS
RSFCMNN

***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 RSFCMNN (RSFCMNN) is a pilot-operated, balanced piston sequence valve designed to supply a secondary circuit with flow once the inlet port pressure exceeds the valve's setting. This specific model regulates pressure at port 1 relative to the drain port 3 and remains unaffected by back pressure at port 2 up to the valve setting. It can replace two-port relief valves when there's return line pressure. Notably, all three-port sequence cartridges are interchangeable in terms of flow path and cavity size for a given frame size. The pilot flow increases as the inlet pressure rises above the setting, while a 150-micron stainless steel screen protects the main stage orifice. The valve setting is directly influenced by pressure at port 3 on a 1:1 ratio, not exceeding 5000 psi (350 bar). Due to spool leakage, it's unsuitable for load-holding applications. The RSFCMNN incorporates Sun's floating style construction to prevent internal part binding from excessive installation torque or machining variations. Cartridges with EPDM seals are suitable for phosphate ester fluids but will degrade with petroleum-based substances. It features adjustable settings via W or Y controls, with special settings representing maximum adjustments if specified. Key specifications include a T-2A cavity, Series 2 capacity of 30 gpm (120 L/min), and factory pressure settings established at 4 gpm (15 L/min). It operates at a maximum pressure of 5000 psi (350 bar) with a control pilot flow between 10-15 in\u00b3/min (0.16-0.25 L/min) and typical response time of 10 ms. Maximum leakage is rated at 3 in\u00b3/min under specified conditions, and adjustment requires several clockwise turns to increase settings. Installation torque is specified between 45-50 lbf\u00b7ft (61-68 Nm), with additional details on adjustment screw and locknut sizes provided for precise application use.