SUN HYDRAULICS
RVGD8DN

$360.48 USD

SUN HYDRAULICS
Material:RVGD8DN
Model:RVGD-8DN
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 RVGD8DN (Material Number: RVGD8DN) is a normally closed modulating valve featuring an integral pilot control cavity. This valve is ventable, externally drained, and utilizes a balanced piston design. It is designed to accept any T8A pressure control cartridge, allowing for customizable pressure regulation. When the inlet port 1 pressure reaches the pilot control cartridge setting, the modulating element opens to tank port 2, throttling flow to maintain desired pressure levels. The valve's design includes a vent port 3 that enables control by remote pilot or two-way valves. This valve can handle maximum pressure at port 2 and is suitable for cross-port relief circuits but not for load-holding applications due to spool leakage. The main stage orifice is protected by a 150-micron stainless steel screen, ensuring durability and reliability in various applications. It incorporates Sun's floating style construction to minimize internal part binding due to excessive installation torque or machining variations. The RVGD8DN's capacity allows for a flow rate of up to 60 gpm (240 L/min), with a maximum operating pressure of 5000 psi (350 bar). The response time of the valve is typically around 10 ms, making it suitable for applications requiring quick adjustments. Pressure at port 4 adds directly to the valve setting at a 1:1 ratio but should not exceed 5000 psi (350 bar). Installation requires careful attention to torque values: the main stage valve should be installed first, followed by the T8A pilot control valve. Cartridges configured with EPDM seals are suited for systems using phosphate ester fluids; exposure to petroleum-based fluids could damage these seals. The RVGD8DN weighs approximately 1.60 lb (0.70 kg) and requires specific installation torque ranging from 150-160 lbf ft (203-217 Nm).

Description

This valve is a normally closed modulating element that incorporates an integral pilot control cavity. It is ventable, externally drained, and 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 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 the inlet (port 1) and the drain (port 4). The vent port (port 3) that tees in between the main piston and pilot control cartridge, allows the modulating element to also be controlled by remote pilot or 2-way valves.

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.
Pressure at port 4 is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar).
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.
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.
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-23A
Series	3
Capacity	60 gpm240 L/min.
Maximum Operating Pressure	5000 psi350 bar
Control Pilot Flow	15 - 20 in³/min.0,25 - 0,33 L/min.
Response Time - Typical	10 ms10 ms
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	1.60 lb0,70 kg
Seal kit - Cartridge	Viton: 990-023-006

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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 HYDRAULICSRVGD8DN

Additional Resources

SUN HYDRAULICS
RVGD8DN