Type DR 20 pressure reducing valve is used to control the pressure. By introducing Rexroth's advanced technology and the most advanced manufacturing equipment from all over the world, Huade® pressure reducing valves are of good quality and low price. Huade is a well-known Chinese national brand, and its products are widely used in many fields such as engineering machinery, water conservancy, machine tools, petroleum and petrochemicals, etc.
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Inlet pressure, port B (MPa) |
up to 31.5 |
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Outlet pressure, port A (MPa) |
up to 5.0, 10.0, 20.0, 31.5 |
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Back pressure, port Y (MPa) |
up to 31.5 |
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Max.flow (Subplate mounting) (L/min) |
DR10 |
DR20 |
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150 |
300 |
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Max. flow (Threaded connections) (L/min) |
DR10 |
DR15 |
DR20 |
DR25 |
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150 |
300 |
300 |
400 |
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Fluid |
Mineral oil(for NBR seal) or |
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Fluid temperature range(℃) |
-30 up to +80 |
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Viscosity range(mm ²/s) |
10 up to 800 |
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Dearee of contamination |
Maximum permissible degree of |
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Characteristic Curves (measured at v=41mm2/s and t=50℃ ) |
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Features:
▶ Subplate mounting
▶ For threaded connections
▶ For manifold mounting
▶ 4 adjustment elements:
. Rotary knob
. Sleeve with hexagon and protective cap,
. Lockable rotary knob with scale
. Rotary knob with scale
▶ 4 pressure settings optional check valve(only for valve for subplate mounting)
Application:
Pilot pressure reducing valve DR 20 is to reducing the pressure in the system.
Pressure valves type DR 20 are pilot operated pressure reducing valves, which are controlled from the secondary circuit. They basically consist of main valve (1) with main spool insert(3) and pilot valve (2) with pressure adjustment element.
At rest, the valves are open, fluid can freely pass from port B to port A via the main spool insert (3).
Pressure present in port A acts upon the bottom side of the main spool. At the same time there is pressure acting on the ball(6) in the pilot valve (2) via the orifice (4) on the spring loaded side of the main piston (3) and via the port(5). Same it is acting on the ball (6) via the orifice (7), control line (8), check valve(9) and orifice (10). According to setting of spring(11), pressure builds up in front of the ball (6), in port (5) and in spring chamber(12), holding the control piston (13) in the
open position. Fluid can freely flow from port B to port A via main spool insert (3), until the pressure in port A exceeds the value set at spring (11) and opens the ball (6).The control
piston (13) moves to closing position.
The desired reduced pressure is achieved, when a balance between the pressure in port A and the pressure set at spring (11) is reached. Pilot oil drain from spring chamber(14) to tank takes place externally via control line (15).
Free return flow from port A to B can be achieved by installing an optional check valve (16).
A pressure gauge connection (17) allows the reduced pressure in port A to be monitored.
structure of subplate mounting type DR 20...50B
Symbols of DR ...50B
Address
No. 27, Yangsha Road, Huilong Town, Nantong City, Jiangsu Province, China
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