SUN HYDRAULICS
RPGSKWN

$118.94 USD

SUN HYDRAULICS
Material:RPGSKWN
Model:RPGS-KWN
Summary:Cartridge

Quantity in stock: 0

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***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 RPGSKWN (RPGSKWN) is a pilot-operated, balanced-poppet relief cartridge designed to serve as a normally closed pressure regulating valve. This valve opens to the tank port when the inlet pressure reaches the set threshold, effectively throttling flow to maintain regulated pressure. It is engineered for precision and efficiency, offering smooth, quiet operation with minimal pressure rise against flow. The internal modulating mechanism ensures resistance against cavitation-related issues such as noise and manifold erosion. Capable of handling maximum pressure at port 2, it is suitable for cross-port relief circuits and load-holding applications. The RPGSKWN remains stable despite fluctuations in oil temperature or contamination levels due to its robust design. It features a main stage orifice shielded by a 150-micron stainless steel screen and incorporates Sun's floating style construction to prevent internal binding from installation torque or machining variations. The valve allows adjustment through W or Y controls, with options for special settings that define the maximum setting range. For systems using phosphate ester fluids, EPDM seals are available; however, these seals are not compatible with petroleum-based substances. Corrosion-resistant variants are offered with stainless steel or zinc-nickel plated components for harsh environments. Designed to operate at a maximum pressure of 5000 psi (350 bar) and accommodate flow capacities up to 50 gpm (200 L/min), this valve exhibits quick response times of approximately 7 ms and minimal leakage at reseat conditions. Installation specifications include a hex size of 1-1/8 inches and torque requirements between 45-50 lbf ft (61-68 Nm). The RPGSKWN weighs approximately 0.50 lb (0.25 kg) and can be serviced using Viton seal kits numbered 990303006 for optimal performance maintenance.

Description

Pilot-operated, balanced-poppet relief cartridges are normally closed pressure regulating valves. When the pressure at the inlet (port 1) reaches the valve setting, the valve starts to open to tank (port 2), throttling flow to regulate the pressure. These valves are accurate, smooth, quiet, fast, and have low pressure rise vs. flow.

Because the modulating occurs inside the cartridge, these valves are immune to most of the problems associated with cavitation, namely noise and manifold erosion.
Will accept maximum pressure at port 2; suitable for use in cross port relief circuits.
Valve is relatively insensitive to varying oil temperatures and oil borne contamination.
Main stage orifice is protected by a 150 micron stainless steel screen.
Suitable for use in load holding applications.
Back pressure on the tank port (port 2) is directly additive to the valve setting at a 1:1 ratio.
Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
W and Y controls (where applicable) can be specified with or without a special setting. When no special setting is specified, the valve is adjustable throughout its full range using the W or Y control. When a special setting is specified, this setting represents the maximum setting of the valve.
Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP for external stainless steel components, or /LH for external zinc-nickel plated components. See the CONFIGURATION section for all options. For further details, please see the Materials of Construction page located under TECH RESOURCES.
Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.

Cavity	T-3A
Series	2
Capacity	50 gpm200 L/min.
Factory Pressure Settings Established at	4 gpm15 L/min.
Maximum Operating Pressure	5000 psi350 bar
Response Time - Typical	7 ms7 ms
Maximum Valve Leakage at Reseat	10 drops/min.0,7 cc/min.
Adjustment - Number of Clockwise Turns to Increase Setting	55
Valve Hex Size	1 1/8 in.28,6 mm
Valve Installation Torque	45 - 50 lbf ft61 - 68 Nm
Adjustment Screw Internal Hex Size	5/32 in.4 mm
Locknut Hex Size	9/16 in.15 mm
Locknut Torque	80 - 90 lbf in.9 - 10 Nm
Model Weight	.50 lb0,25 kg
Seal kit - Cartridge	Viton: 990-303-006

Show FAQ

What are the tolerances on pressure settings for Sun's pressure control valves?	Pressure setting tolerances are listed in our Performance Data page. A link to this page can also be found in the Additional Resources tab of the applicable product page.
How big is a drop of hydraulic oil?	There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
Can I use a kick-down relief for my system relief?	Maybe not. We build in a good amount of overlap in the kick-down reliefs to prevent false tripping. This means they are not as fast as our standard pilot-operated reliefs. A direct-acting relief valve set just above the kick-down relief valve would be good insurance.
Direct acting or pilot operated - what do I use?	Direct-acting valves are used to prevent over pressure, and pilot-operated valves are used to regulate pressure. If you are unsure, use a direct-acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot-operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.
Where would I use a kick-down relief?	One graphic example is on a portable grain auger for silos. When the farmer gets caught in the auger the kick-down relief trips and allows him to escape.

SUN HYDRAULICSRPGSKWN

Additional Resources

SUN HYDRAULICS
RPGSKWN