SUN HYDRAULICS
RPKTCWV

$721.17 USD

SUN HYDRAULICS
Material:RPKTCWV
Model:RPKT-CWV
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 RPKTCWV (RPKTCWV) is a pilot-operated, anti-shock relief cartridge designed to limit maximum system pressure and control the rate of pressure rise. This valve features a unique ramp-closing mechanism that operates at a constant speed, independent of settings and flows. The adjust screw sets both the maximum relief and minimum threshold pressures, but adjustments can only be made when system pressure is removed. Capable of accepting maximum pressure at port 2, this valve is suitable for cross-port relief circuits but not for load-holding applications. It protects pumps and motors from pressure transients caused by sudden load changes, especially in variable displacement pumps where the displacement mechanism may lag. Additionally, it reduces jerks in hydrostatic drives during sudden reversals and can emulate ramp characteristics typical of proportional valves when used with a switching device. The RPKTCWV is ideal for small power units that need to start against an anti-shock relief to prolong pump life. It incorporates Sun's floating style construction to minimize internal binding due to installation torque or machining variations. The valve has a cavity size of T-18A, Series 4 capacity of 200 gpm (760 L/min), and operates at a maximum pressure of 5000 psi (350 bar). With a typical response time of 2 ms and a pressure ramp-up time between 400-600 ms, it offers efficient performance. The adjustment requires approximately 4.5 clockwise turns to increase the setting, with specific torque values provided for installation and locknut adjustments. Weighing 2.50 lb (1.15 kg), this cartridge includes Viton seal kits for enhanced durability in various applications.

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.

Will accept maximum pressure at port 2; suitable for use in cross port relief circuits.
The seals on the adjust screw are exposed to system pressure which means this valve can only be adjusted when the pressure is removed. The setting procedure is; check the setting, remove the pressure, adjust the valve, check the new setting.
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.
All 2-port relief cartridges (except pilot reliefs) are physically and functionally interchangeable (same flow path, same cavity for a given frame size).
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-18A
Series	4
Capacity	200 gpm760 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	400 - 600 ms400 - 600 ms
Adjustment - Number of Clockwise Turns to Increase Setting	4.54.5
Valve Hex Size	1 5/8 in.41,3 mm
Valve Installation Torque	350 - 375 lbf ft474 - 508 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	2.50 lb1,15 kg
Seal kit - Cartridge	Viton: 990-318-006

Show FAQ

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.
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.

SUN HYDRAULICSRPKTCWV

Additional Resources

SUN HYDRAULICS
RPKTCWV