SUN HYDRAULICS
PRDNXDN924

$269.90 USD

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SUN HYDRAULICS
Material:PRDNXDN924
Model:PRDN-XDN@924
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 PRDNXDN924 (Material Number: PRDNXDN924) is an electroproportional, direct-acting reducer-reliever valve designed to manage hydraulic pressure efficiently. It reduces a high primary pressure at the inlet port 2 to a constant reduced pressure at port 1 and includes a full flow relief function from port 1 to tank port 3. The valve is initially set in the reducing mode, connecting port 2 to port 1 at a predefined pressure setting, which can be adjusted by increasing the current to the coil; this action proportionally decreases the reduced pressure at port 1. If the pressure at port 1 surpasses the coil-induced setting, it is relieved to port 3. This valve features low oil consumption due to its closed transition between reducing and relieving modes. The maximum allowable pressure at port 3 is 3000 psi (210 bar), and any pressure here directly adds to the valve setting in a 1:1 ratio. Leakage occurs out of port 3 with a supply pressure of 2000 psi (140 bar) and varies with pressure differential and viscosity. For optimal performance, use an amplifier with adjustable dither between 100 - 250 Hz. Coils are interchangeable with other Sun solenoid-operated valves. This valve is ideal for accumulator circuits as it minimizes secondary circuit leakage due to its direct-acting design, which ensures reliable operation even in contaminated systems or dead-headed conditions. Reverse flow from reduced pressure port 1 to inlet port 2 may cause closure of the main spool; hence, incorporating a separate check valve is advisable if reverse free flow is necessary. The PRDNXDN924 features Sun's floating style construction, minimizing internal part binding from excessive installation torque or machining variations, making it physically interchangeable among three-port cartridges of similar frame sizes.

Description

This electro-proportional, direct-acting reducer/reliever valve reduces a high primary pressure at the inlet (port 2) to a constant reduced pressure at port 1, with a full flow relief function from port 1 to tank (port 3). The valve is biased to the reducing mode, connecting port 2 to port 1 at a customer specified pressure setting. Increasing the current to the coil will proportionally decrease the reduced pressure at port 1. If pressure at port 1 exceeds the setting induced by the coil, pressure at port 1 is relieved to port 3. This valve is closed in the transition between reducing and relieving resulting in very low consumption of oil.

Maximum pressure at port 3 should be limited to 3000 psi (210 bar).
Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 3000 psi (210 bar).
Leakage specified in Technical Data is out of port 3 with a supply pressure of 2000 psi (140 bar) and the valve set at mid range. This leakage is directly proportional to pressure differential and inversely proportional to viscosity expressed in centistokes.
The transition from reducing to relieving is closed. The result is very low leakage. However, there is a transitional step increase in pressure between reducing and relieving modes. This step equals about 5% of the high end of the adjustment range, independent of the valve setting.
For optimum performance, an amplifier with current sensing and adjustable dither should be used. Dither should be adjustable between 100 - 250 Hz.
Coils are interchangeable with Sun's other full flow, solenoid-operated valves and can be mounted on the tube in either direction.
With no electrical signal, the reduced pressure setting will default to the customer specified value. Increasing the command to the coil will proportionally reduce the secondary pressure value.
Suitable for accumulator circuits since the absence of pilot control flow results in reduced secondary circuit leakage.
Direct acting concept provides highly reliable operation in contaminated systems, especially at dead headed conditions.
Full reverse flow from reduced pressure (port 1) to inlet (port 2) may cause the main spool to close. If reverse free flow is required in the circuit, consider adding a separate check valve to the circuit.
All three-port pressure reducing and reducing/relieving cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size). When considering mounting configurations, it is sometimes recommended that a full capacity return line (port 3) be used with reducing/relieving 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-11A
Series	1
Capacity	5 gpm20 L/min.
Maximum Operating Pressure	5000 psi350 bar
Maximum Valve Leakage at 110 SUS (24 cSt)	2.5 in³/min.41 cc/min.
Solenoid Tube Diameter	.75 in.19 mm
Valve Hex Size	7/8 in.22,2 mm
Valve Installation Torque	30 - 35 lbf ft41 - 47 Nm
Model Weight (with coil)	1.20 lb0,55 kg
Seal kit - Cartridge	Viton: 990-511-006
Seal and nut kit - Coil	Viton: 990-770-006Viton: 990-770-006

Show FAQ

Will your reducing/relieving valve relieve my pump to tank?	No. A reducing/relieving valve throttles a supply of oil to maintain a set pressure in a secondary circuit. The valve is open until the secondary or downstream pressure rises to the setting of the valve at which time it starts to close to limit the pressure. If the secondary or downstream pressure is caused to go above the setting, the valve shifts into relieving mode and throttles the secondary circuit back to tank to prevent over-pressure. At no time can the valve connect the supply to tank.
How big is a drop of hydraulic oil?	There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
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.
Can I back flow through a reducing valve from port 1 to port 2?	Yes. A reducing or reducing/relieving valve is normally open. If the pressure in the secondary circuit is less than the setting, it will be open.2 caveats: (1) If the valve is in the reducing mode and you suddenly reverse the flow, the valve will not have time to open and will shift into relieving mode or (2) If the back flow generates a pressure drop through the valve that exceeds the setting, the valve will shift into the relieving mode.When in doubt, use a reverse flow check.
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.
I need a reducer on B. Can I connect the drain to A?	Yes. If you look in the sandwich section you will see that we offer many such packages. When you are pressurizing B, A is connected to tank, allowing the reducer to do its job. When you reverse, the drain or tank port of the reducer is pressurized by A. This increases the setting of the reducer and helps keep the reducer open in the reverse flow direction.
What do you mean by maximum differential?	Our reducing valves are outside-in valves; the supply pressure on the outside of the working parts is higher than the inside. At some pressure differential, the outside (sleeve) will close in on the piston and cause the valve to stick. A D range is adjustable from 25 to 800 psi with a maximum differential of 2000 psi. This means you could set the valve at 600 psi and expect it to work correctly with a supply pressure of 2600 psi. The valve may work at higher differentials, but we do not recommend it. The W and C ranges are tested over their entire range with an inlet pressure of 5000 psi. All direct-acting valves are tested with an inlet pressure of 5000 psi.

SUN HYDRAULICSPRDNXDN924

Additional Resources

SUN HYDRAULICS
PRDNXDN924