Pressure Reducing and Relieving Valves
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- Muriel Hodge
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1 reducing and relieving valves are composite pressure control valves having pressure reducing and counterbalancing functions developed for hydraulic balancing circuits. Specifications RBG-- * - * RBG-6- * - * Max. Operating () 4 () 5 (6) Pres. Adj. Range ().6-.5 (9-96) (-55) Max. Flow 5 (.) 5 () Flow 5 (.) 5 () Drain Flow.6- (.6-.6).5- (.4-.5) Approx. Mass kg (lbs.) 4. (9.) (4.) Model Number Designation F- RB G - -R - Special Seals F: Special Seals for Phosphate Ester Type Fluids (Omit if not required) Series Number RB: Reducing and Valves Type of Mounting G: Mounting Valve 6 Drain Type None: Internal Drain R: External Drain Design Number * Design Standards Refer to Design Standards: None... Japanese Standard "JIS" 8... European Design Standard 9... N. American Design Standard Attachment Mounting Bolts Valve RBG- RBG-6 Valve Model Numbers RBG- RBG-6 Japanese Standard "JIS" European Design Standard M 65 Lg. M 7 Lg. Socket Head ap Screw (4 pcs.) N. American Design Standard /8-6 UN -/ Lg. /8-6 UN -/4 Lg. Japanese Standard "JIS" European Design Standard N. American Design Standard RBGM-- RBGM-X- RBGM-6- RBGM-6X- Rc /8 Rc / Rc /4 Rc RBGM--8 RBGM-X-8 RBGM-6-8 RBGM-6X-8 Instructions To use remote control relief valve in the venting circuit, see page. If the internal volume of the vent line is too large, chattering is likely to occur. Thus, as far as possible reduce the inside diametre and the length of the pipe. To adjust the pressure, loosen the lock nut and turn the pressure adjustment handle slowly clockwise for higher pressures and anti-clockwise for lower pressures. After adjustments, do not forget to tighten the lock nut. is limited by collars fitted. If a working pressure cannot be attained, remove some collars. One collar is equivalent to (45 ). onnect the tank pipe not to any other line but directly to the reservoir. /8 BSP.F / BSP.F /4 BSP.F BSP.F RBGM--9 RBGM-X-9 RBGM-6-9 RBGM-6X-9 Graphic Symbols Internal drain External drain / NPT /4 NPT NPT Approx. Mass kg (lbs.) s are available. Specify the sub-plate model number from the table above. When sub-plates are not used, the mounting surface should have a good machined finish..6 (.5) 4.8 (.6) 6
2 PRESSURE ONTROLS RBG--* -/8/9 Drain Port "A" Thd. (Only for External Drain Type) Primary Port 95 (.74) 89 (.5) (.6) (.44) 5 (.5) 5 (.97) 6 (.44) (.9) Vent Port 4.9 (.69) 5 (.59) 7 (.87) Fully Extended 56 (6.4) Tank Port (.4) Dia. Through 7.5(.69) Dia. Spotface Two ollars Lock Nut 4(.55) Hex. Secondary Port 44(.7) Dia. RBG--* - RBG--* -8 RBG--* -9 Adj. Handle IN. (.8) 75 (.95) 97.5 (.84) "A" Thd. Rc /4 /4 BSP.F /4 NPT Reducing and Valves Mounting Surface (s Furnished) : RBGM- -/8/9 X DIMENSIONS IN MILLIMETRES (INHES) (.9).7 (.7) (4.) 8(.) 6(.4) (.8) "A" Thd. Places (From Rear) (.9) 66.7(.6) 58.7(.).(.) 7.9 (.) 8 (.) 7(.76) 9(.54) 4(.55) Dia. Places "" Thd. (.79) Deep 7.(.8).4(.84) 5.7(.4) (.69) (.77) 8.8(.5) Dia. Through 4(.55) Dia. Spotface 6.(.4) Dia. "B" Thd. (From Rear) "A" Thd. "B" Thd. "" Thd. (.6) RBGM-- RBGM--8 RBGM--9 Rc /8 /8 BSP.F Rc /4 /4 BSP.F /4 NPT M /8-6 UN 5(.59) 6(.6) RBGM-X- RBGM-X-8 Rc / / BSP.F Rc /4 /4 BSP.F M RBGM-X-9 / NPT /4 NPT /8-6 UN 6
3 RBG-6-* -/8/9 "A" Thd. RBG-6- * - Rc /8 RBG-6- * -8 /8 BSP.F Primary Port 5 (4.5) Fully Extended 74.4(.9) 7.5 (8.56) 6. (.7) Tank Port (.4) Dia. Through 7.5(.69) Dia. Spotface. (.48) RBG-6- * -9 Adj. Handle IN. Two ollars Lock Nut 4(.55) Hex. Vent Port "A" Thd. 56 (.) 57 (.4) 6 (4.57) 9 (5.47) 44(.7) Dia (.) 4 (4.9) Secondary Port Drain Port Mounting Surface (s Furnished) 6 : RBGM- -/8/9 6X "J" Thd. 8(.7) Deep B (.47) A (.) 5 (5.9) 6 (4.96) 6. (.7) 49. (.94). (.9). (.44) 8.6(.4) (.9) Dia. Places (.4) Dia. Through 7.5(.69) Dia. Spotface 9.7 (.56) (.87) (.47) 7 (.87) 79.4 (.) 6 (4.57) 4 (5.5) Model Numbers RBGM-6 RBGM-6X A.7 (.8).4 (.8) DIMENSIONS IN MILLIMETRES (INHES) Dimensions mm (Inches) B D E 65.7 (.59) 69.7 (.74) 95 (.74) 98.4 (.87) 7. (.46).5 (.8) 89. (.5) 9.8 (.69) "F" Thd. Places (From Rear) D E 6.(.4) Dia. "H" Thd. (From Rear) RBGM-6- RBGM-6-8 "F" Thd. Rc /4 /4 BSP.F "H" Thd. Rc /4 /4 BSP.F "J" Thd. M 9(.75) (.79) 45 (.77) RBGM-6-9 RBGM-6X- RBGM-6X-8 RBGM-6X-9 /4 NPT Rc BSP.F NPT /4 NPT Rc /4 /4 BSP.F /4 NPT /8-6 UN M /8-6 UN 6
4 PRESSURE ONTROLS Nominal Override haracteristics Hydraulic Fluid: Viscosity 5 mm /s (64 SSU), Specific Gravity.85 Secondary Reducing Min. Adj. & Vent Hydraulic Fluid: Viscosity 5 mm /s (64 SSU), Specific Gravity RBG- RBG- Min. Adj. Vent. 4 5 Secondary RBG RBG Reducing and Valves Drop Hydraulic Fluid: Viscosity 5 mm /s (64 SSU), Specific Gravity RBG- 6.4 RBG-6 Drop P 4... Drop P For any other viscosity, multiply the factors in the table below. mm /s Viscosity SSU Factor For any other specific gravity (G'), the pressure drop ( P') may be obtained from the formula below. P'= P (G'/.85) 6
5 Spare Parts List RBG--* -/8/ List of Seals Item Name of Parts Part Numbers Qty. Remarks SO-NB-P4 SO-NB-P8 SO-NB-P9 SO-NA-P9 Included in Seal Kit Kit No. : KS-RBG RBG-6-* -/8/ Design 8 Only List of Seals Item Name of Parts Part Numbers Qty. Remarks 4 Bonded Seal SO-NB-P9 SO-NB-P4 SO-NB-P8 SO-NB-P SO-NA-P9 SG-FB-/8 Included in Seal Kit Kit No. : KS-RBG-6- Note: No bonded seals are included in the seal kits. 64
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