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PRB - Pressure Reducing Valve Pilot Operated

PRB - Pressure Reducing Valve Pilot Operated
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PRB - Pressure Reducing Valve Pilot Operated - 1

Industrial Products Size 10 to 30 up to 315 bar up to 300 L/min Pressure Valves Pressure Reducing Valve Pilot Operated Type PRB, Series 10 Data Sheet R-1004/10.98 GB Features ◊ Compact construction. ◊ Large maximum flow volume. ◊ Stable pressure control. ◊ Suitable for manifold mounting. ◊ Two pressure settings. ◊ Three adjustment elements. ◊ Optional check valve. Type PRB Functional Description 2 Type PRB Series 10 Pressure Reducing Valves are balanced piston, pilot operated type reducing valves that are used to reduce pressure in a hydraulic circuit. Type PRB Series 10 Pressure Reducing Valves will maintain the specified secondary side pressure even when primary side pressure fluctuates. 10 9 6 11 8 5 The valves primarily comprise a main valve (1) with main spool insert (3), and a pilot valve (2) with an adjustment element that facilitates setting system pressures. When not in use, the valve is open, and fluid can flow freely from port A to port B via the main spool insert (3). 4 14 3 12 7 13 When pressure is present in port B, it acts on the bottom side of the main spool, and on the pilot valve (6): 1 15 ◊ Via orifice (4) on the spring loaded side of the main piston (3), and via port (5). ◊ Via orifice (7), control line (8), check valve (9) and orifice (10). According to the spring (11) pressure setting, pressure builds up in front of the valve (6), in port (5) and in the spring chamber (12), holding the spool insert (3) in the open position. Fluid flows freely from port A to port B via the main spool insert (3) until the pressure in port B exceeds the value set at spring (11) when the valve opens. The spool insert (3) now moves to the closed position. B Page 1.5 Y 16 Pilot oil drain from the spring chamber (14) to tank occurs externally via control line (15). Free return flow from port B can be achieved by fitting a check valve (16). The desired pressure reduction is achieved when the pressure in port B is balanced with the pressure set at the spring (11). Model PRB A Data Sheet R-1004/10.98

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PRB - Pressure Reducing Valve Pilot Operated - 2

Pressure Valves Industrial Products Ordering Code – Pressure Reducing Valve, Pilot Operated PRB 10 P 10 1 100 Y C Pressure Reducing Valve, Pilot Operated Suitable Oil No Code: Mineral Oil V: Phosphate Ester W: Fatty Acid Ester, Water Glycol Size 10, 20, 30 Type of Mounting P: V Reverse Free-Flow Check Valve Sub-plate Mounting No Code: Without Reverse Check Valve C: With Reverse Check Valve Series Number 10 Drain Line Adjusting Element 1: 2: 3: Y: Rotary Knob Thread Pin with Hexagon and Protective Cap Lockable Rotary Knob Externally Drained Maximum Reduced Pressure 100: 315: 100 bar 315 bar...

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PRB - Pressure Reducing Valve Pilot Operated - 3

Industrial Products Pressure Valves Characteristic Curves Measure at ν = 36cSt and t = 50°C 10 Pressure differential in bar Pressure in bar 10 8 6 4 PRB30 2 PRB20 PRB10 0 50 100 150 200 250 300 PRB20 8 PRB30 PRB10 6 4 2 0 50 100 Flow in L/min Minimum setting pressure PRB 10 PRB Secondary pressure in bar Secondary pressure in bar 300 250 200 150 100 50 20 200 300 40 60 80 20 30 250 200 150 100 50 0 50 100 150 200 Flow in L/min Flow in L/min Pressure override Model PRB 250 Pressure differential of check valve 300 0 150 Flow in L/min Pressure override Page 3.5 Data Sheet R-1004/10.98 250 300

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PRB - Pressure Reducing Valve Pilot Operated - 4

Pressure Valves Industrial Products Unit Dimensions – Valve for Sub-plate Mounting (dimensions in mm) L5 Ø6, Ø13 Depth H6 (groove for O-ring) L2 L3 2-ØD1, ØD2 Depth H6 (groove for O-ring) Ø35 K B B2 B1 164 Y A PRB*P-10-2/* J1 J2 Max 187 L6 L4 30 J3 Ø60 L1 PRB*P-10-1/* Max 187 Hex 30 H2 Hex 19 H4 4 4 N H5 Hex 30 H3 16 H1 Ø60 PRB*P-10-3/* A Ø6 A Y B With Reverse Check Valve Y B Without Reverse Check Valve Symbol Model PRB Page 4.5 Data Sheet R-1004/10.98

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