SUN HYDRAULICS
RPIC8DV

$203.70 USD

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SUN HYDRAULICS
Material:RPIC8DV
Model:RPIC-8DV
Summary:Cartridge

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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 RPIC8DV (RPIC8DV) is a normally closed modulating valve that incorporates an integral pilot control cavity. This valve features a balanced piston design and is engineered for precision pressure regulation. It operates by allowing the pilot control cavity to accept any T8A pressure control cartridge, which determines the pressure differential between port 1 (inlet) and port 2 (tank). Once the inlet pressure reaches the pilot cartridge's setting, the modulating element opens to throttle flow to the tank port, effectively regulating pressure. Notably, this valve can handle maximum pressure at port 2, making it suitable for cross-port relief circuits. However, it is not recommended for load-holding applications due to potential spool leakage. The RPIC8DV includes a main stage orifice protected by a 150-micron stainless steel screen and incorporates Sun's floating style construction to reduce internal binding risks. The valve also features backpressure on the tank port as directly additive to the valve setting at a 1:1 ratio. Installation requires torque specifications: 150-160 lbf ft for the main stage valve and separate torque values for any T8A pilot control cartridges used. This product is ideal for applications requiring precise pressure modulation in hydraulic systems and offers compatibility with various pilot control cartridges sold separately, including electroproportional, solenoid, air pilot, and hydraulic pilot operation types. With a Cavity/T-16A series capacity of up to 100 gpm (380 L/min) and a maximum operating pressure of 5000 psi (350 bar), it provides robust performance in demanding environments. The valve has a leakage rate of approximately 4 in\u00b3/min at 1000 psi (65 cc/min at 70 bar). For maintenance or replacement needs, Viton seal kits are available under part number 990016006.

Description

This valve is a normally closed modulating element that incorporates an integral pilot control cavity. It is a balanced piston design. The pilot control cavity will accept any T-8A pressure control cartridge. When the pressure at the inlet (port 1) reaches the pilot control cartridge's setting, the modulating element starts to open to tank (port 2), throttling flow to regulate the pressure. The pilot cartridge's setting determines the difference in pressure between port 1 and port 2.

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.
Main stage orifice is protected by a 150 micron stainless steel screen.
Not suitable for use in load holding applications due to spool leakage.
Back pressure on the tank port (port 2) is directly additive to the valve setting at a 1:1 ratio.
NOTE: With the -8 control option, the main stage valve should first be installed to the correct torque value. The T-8A pilot control valve should then be installed into the main stage valve to its required torque value.
The -8 control option allows the pilot control valve to be incorporated directly into the end of the relief cartridge via the T-8A cavity. These pilot control cartridges are sold separately and include electro-proportional, solenoid, air pilot, and hydraulic pilot operation. See Pilot Control Cartridges.
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-16A
Series	3
Capacity	100 gpm380 L/min.
Maximum Operating Pressure	5000 psi350 bar
Control Pilot Flow	15 - 20 in³/min.0,25 - 0,33 L/min.
Pilot Control Cavity	T-8AT-8A
Main stage leakage at 110 SUS (24 cSt)	4 in³/min.@1000 psi65 cc/min.@70 bar
Valve Hex Size	1 1/4 in.31,8 mm
Valve Installation Torque	150 - 160 lbf ft203 - 217 Nm
Model Weight	1.20 lb0,55 kg
Seal kit - Cartridge	Viton: 990-016-006

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Additional Resources

Notes:

Compound cartridge (pilot and main stage) assembly information is provided for reference only. Cartridges must be ordered separately and assembled at point of use.

How do I get a kick-down relief to reset?	The kick-down relief acts much like a circuit breaker. When the pressure at the inlet (port 1) of the relief valve rises to the setting, the valve pops open and drops the pressure down to 100 psi or so. The valve stays open until flow through it stops. Shutting off the supply of oil will reset the valve; reversing pressure on the valve is a positive way of resetting it.
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.
How big is a drop of hydraulic oil?	There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
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.
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 HYDRAULICSRPIC8DV

Additional Resources

SUN HYDRAULICS
RPIC8DV