SUN HYDRAULICS
RSHCLDN

***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 RSHCLDN (RSHCLDN) 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. It regulates pressure at port 1 relative to the drain port 3, remaining insensitive to back pressure at port 2 up to the valve setting. These valves can replace 2-port relief valves when there is pressure in the return line. The RSHCLDN model features interchangeable 3-port sequence cartridges, maintaining consistent flow paths and cavity sizes for a given frame. As inlet pressure increases above the valve setting relative to drain pressure, pilot flow continues to rise. A 150-micron stainless steel screen protects the main stage orifice, and pressure at port 3 adds directly to the valve setting at a 1:1 ratio, not exceeding 5000 psi (350 bar). The valve is unsuitable for load-holding applications due to spool leakage but offers adjustable settings with W and Y controls unless specified otherwise. Sun's floating style construction minimizes risks of internal binding from excessive torque or machining variations. The RSHCLDN has a T-17A cavity, Series 3 capacity of up to 60 gpm (240 L/min), and operates under maximum pressures of 5000 psi (350 bar). Control pilot flow ranges between 15-20 in\u00b3/min (0.25-0.33 L/min), with typical response times around 10 ms. Valve leakage is minimal at specified conditions, and adjustments are made via clockwise turns on an internal hex screw. The model weighs approximately 1.50 lb (0.70 kg) and uses Viton seal kits for maintenance needs.