Sun PBJB8WN Pilot-operated pressure reducing main stage with integral T-8A

Description

Sun PBJB8WN Pilot-operated, pressure reducing main stage with integral T-8A control cavity
Description
Sun Hydraulics PBJB8WN Pilot-operated, pressure reducing main stage with integral T-8A control cavity.
This valve is a normally open modulating element that incorporates an integral pilot control cavity. The pilot control cavity will accept any T-8A pressure control cartridge. The valve reduces a high primary pressure at the inlet (port 2) to a constant reduced pressure at port 1. The pilot cartridge's setting determines the difference in pressure between reduced pressure (port 1) and the drain (port 3).
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.
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.
Main stage orifice is protected by a 150 micron stainless steel screen.
Pilot operated valves exhibit very low dead-band transition between reducing and relieving modes.
Pilot operated valves exhibit exceptionally flat pressure/flow characteristics, are very stable and have low hysteresis.
Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar).
Maximum inlet pressure is determined by the bias spring. The D spring is tested with 2000 psi (140 bar) maximum differential pressure and the W spring is tested with 5000 psi (350 bar) maximum inlet pressure.
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.
Satisfaction Guarantee
All of the products that are for sale through Automation Hydraulics are surplus from our product development business.  They are all either new or have only been used lightly in our shop or in demonstration applications.  We guarantee that all items ship in full working order and free of contamination.  Used items may have lubricants or other minor cosmetic damage.  All of the hydraulics equipment that we have for sale requires the use of filtered hydraulic oil.  Please consult the manufacturers' for the fluid cleanliness recommendation of your products.  If you are not fully satisfied with the condition of the item you've purchased, let us know within 30 days of receipt for replacement or refund.
To receive a refund or replacement, we require you provide photos and documentation of your filtration system and application to ensure that your use was in accordance with with the manufacture's requirements.
Shipping
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For items that are shipping via commercial freight, we will need to know the following information in addition to the shipping address:
- Is this a business address (YES / NO)?
- Is a liftgate required?
- Who should the carrier notify if they have any issues delivering the shipment?
- What phone number should be provided to the carrier?
Return Policy
We have a robust and generous satisfaction guarantee that backs every one of our sales.  We do not offer returns for any other reasons other than unacceptable condition of the item.
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