SUN HYDRAULICS
RVISKWN

$534.43 USD

SUN HYDRAULICS
Material:RVISKWN
Model:RVIS-KWN
Summary:Cartridge

Quantity in stock: 0

Note: Sales tax, and shipping will be calculated at checkout.

***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 RVISKWN (RVISKWN) is a ventable, pilot-operated, balanced-poppet relief cartridge designed for precise pressure regulation in hydraulic systems. This normally closed valve opens when the inlet port pressure reaches its set value, allowing flow to the tank port to maintain regulated pressure. A vent port between the main piston and pilot stage enables remote control through other pilot or two-way valves. Known for their accuracy and low-pressure rise versus flow, these valves operate smoothly and quietly with moderate speed. The internal modulation minimizes cavitation issues like noise and manifold erosion. Suitable for load-holding applications, they require zero leak valving on the vent port for optimal performance. The valve can handle maximum pressure at port 2, making it ideal for cross-port relief circuits. Remote pilot relief on the vent port allows control below the valve's setting, while it remains largely unaffected by oil temperature variations and contamination. A 150-micron stainless steel screen protects the main stage orifice from debris. Back pressure at the tank port adds directly to the valve setting at a 1:1 ratio. The Sun floating style construction reduces risks of internal binding due to excessive installation torque or machining variations in cavity/cartridge interfaces. The RVISKWN fits into a T-19A cavity and has a series 4 capacity of up to 120 gpm (480 L/min). It operates at a maximum pressure of 5000 psi (350 bar) with a control pilot flow between 15-20 in\u00b3/min (0.25-0.33 L/min). Typical response time is around 2 ms with maximum leakage upon reseat being 10 drops/min (0.7 cc/min). Installation requires specific torque settings and hex sizes for adjustment screws and locknuts, ensuring proper setup and function within hydraulic systems demanding reliable pressure regulation solutions.

Description

Ventable, 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. They provide a vent port (port 3) that connects between the main piston and pilot stage to provide for remote control by other pilot or 2-way valves. These valves are accurate, have low pressure rise vs. flow, they are smooth and quiet, and are moderately fast.

Because the modulating occurs inside the cartridge, these valves are immune to most of the problems associated with cavitation, namely noise and manifold erosion.
Suitable for use in load holding applications, providing that any valving on the vent port (port 3) is zero leak.
Will accept maximum pressure at port 2; suitable for use in cross port relief circuits.
A remote pilot relief on port 3 (vent) will control the valve below its own setting.
Valve is relatively insensitive to varying oil temperatures and oil borne contamination.
Main stage orifice is protected by a 150 micron stainless steel screen.
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-19A
Series	4
Capacity	120 gpm480 L/min.
Factory Pressure Settings Established at	4 gpm15 L/min.
Maximum Operating Pressure	5000 psi350 bar
Control Pilot Flow	15 - 20 in³/min.0,25 - 0,33 L/min.
Response Time - Typical	2 ms2 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 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	3.10 lb1,40 kg
Seal kit - Cartridge	Viton: 990-219-006

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 HYDRAULICSRVISKWN

Additional Resources

SUN HYDRAULICS
RVISKWN