Dual, direct-acting relief valve - pilot capacity

Capacity: .25 gpm1 L/min. | Cavity: T-11A
RBAD : Dual, direct-acting relief valve - pilot capacity
Technical Features [ + ]

This direct-acting, pilot relief cartridge incorporates back-to-back check valves. This allows it to remotely control 2 other pilot-operated valves or act as a thermal relief for both ends of an actuator. Because capacity is limited to pilot flow, this valve should be used with other valves with comparable pilot flows.

  • The back-to-back check valves prevent cross talk between the two valves that are being remote controlled.
  • One adjustment controls two valves.
  • Check cracking pressure is 15 psi (1 bar).
  • Pressure at port 3 is directly additive to the valve setting.
  • Suitable for load holding applications
  • The term thermal relief means it prevents overpressure due to thermal expansion of the fluid.
  • 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.
Technical Data [ + ]
Note: Data may vary by configuration. See CONFIGURATION section.
Cavity T-11A
Series 1
Capacity .25 gpm1 L/min.
Response Time - Typical 2 ms2 ms
Maximum Valve Leakage at 110 SUS (24 cSt) 5 drops/min.0,3 cc/min.
Adjustment - No. of CW Turns from Min. to Max. setting 55
Valve Hex Size 7/8 in.22,2 mm
Valve Installation Torque 30 - 35 lbf ft41 - 47 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
Seal kit - Cartridge Buna: 990011007
Seal kit - Cartridge Polyurethane: 990011002
Seal kit - Cartridge Viton: 990011006
Performance Curves [ + ]
FAQs [ + ]

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 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.

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.

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.

There are exactly 250 Sun drops in a cubic inch or 15 in a cc.

Notes [ + ]
  • For Series 1 cartridges configured with an O control (panel mount handknob), a .75 in. (19 mm) diameter hole is required in the panel.
Additional Resources [ + ]