SUN HYDRAULICS
RPETCWN

$151.00 USD

SUN HYDRAULICS
Material:RPETCWN
Model:RPET-CWN
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 RPETCWN (RPETCWN) is a pilot-operated, anti-shock relief cartridge designed to limit both maximum system pressure and the rate of pressure rise. This valve opens and closes at a constant speed, independent of settings and flows, with the adjust screw determining the maximum relief and minimum threshold settings. It is physically and functionally interchangeable with all 2-port relief cartridges except pilot reliefs, featuring the same flow path and cavity for a given frame size. Suitable for cross-port relief circuits, it accepts maximum pressure at port 2 but is not recommended for load-holding applications. The valve activates when inlet port 1 pressure exceeds the threshold setting, opening to tank port 2 as the pilot section moves forward steadily to increase the setting by compressing the pilot spring until a mechanical stop is reached at maximum setting. The RPETCWN provides protection against pressure transients due to sudden load changes in pumps and motors, especially variable displacement pumps where displacement mechanisms may be too slow. It also reduces jerkiness in hydrostatic drives caused by sudden reversals and can mimic ramp characteristics typical of proportional valves when used with a switching device. Ideal for small power units started against an anti-shock relief, it ensures longer pump life. The backpressure on tank port 2 directly adds to the valve setting at a 1:1 ratio. Its design incorporates Sun's floating style construction to minimize internal part binding due to excessive installation torque or cavity/cartridge machining variations. The valve has a capacity of 25 gpm (95 L/min), operates up to 5000 psi (350 bar), and features adjustments via an internal hex screw with a locknut for secure settings.

Description

Pilot-operated, anti shock relief cartridges limit maximum system pressure and also limit the rate of pressure rise. The valve opens and then ramps closed at a constant speed, independent of settings and flows. The adjust screw determines the maximum (relief) setting and the minimum (threshold) setting.

All 2-port relief cartridges (except pilot reliefs) are physically and functionally interchangeable (same flow path, same cavity for a given frame size).
Will accept maximum pressure at port 2; suitable for use in cross port relief circuits.
Not suitable for use in load holding applications.
When pressure at the inlet (port 1) exceeds the threshold setting, the valve opens to tank (port 2). The pilot section moves forward at a steady rate, increasing the setting by compressing the pilot spring. Maximum setting is achieved when the pilot section reaches a mechanical stop.
Valve provides protection for pumps and motors from pressure transients due to sudden load changes, especially variable displacement pumps, since the displacement mechanism is sometimes too slow to catch these pressure transients.
Valve provides protection for hydrostatic drives by reducing the jerk caused by sudden reversals. The valve is suitable for cross-port applications.
When used with a switching device, the valve can provide the ramp characteristic typically provided by proportional valves.
Small power units can be started against an anti shock relief to provide longer pump life.
Back pressure on the tank port (port 2) is directly additive to the valve setting at a 1:1 ratio.
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-10A
Series	1
Capacity	25 gpm95 L/min.
Factory Pressure Settings Established at	4 gpm15 L/min.
Maximum Operating Pressure	5000 psi350 bar
Control Pilot Flow	10 - 25 in³/min.0,16 - 0,41 L/min.
Response Time - Typical	2 ms2 ms
U.S. Patent #	6,039,0706,039,070
Pressure Ramp Up Time	100 - 300 ms100 - 300 ms
Adjustment - Number of Clockwise Turns to Increase Setting	4.54.5
Valve Hex Size	7/8 in.22,2 mm
Valve Installation Torque	30 - 35 lbf ft41 - 47 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	.30 lb0,15 kg
Seal kit - Cartridge	Viton: 990-310-006

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 HYDRAULICSRPETCWN

Additional Resources

SUN HYDRAULICS
RPETCWN