DB···50C series pilot-operated relief valves are available in three sizes (plate type): 10, 20 and 30, and in five sizes (tube type): 10, 15, 20, 25 and 30. The set pressures are 5.0MPa, 10MPa, 20MPa, 31.5MPa and 35MPa. The flow rates are 250L/min (size 10), 500L/min (size 15, 20 and 25) and 650L/min (size 32). The connection modes are plate type, tube type and plug-in type.
Compared with the DB···3XC series pilot relief valve introduced and mass-produced by our company, the DB···50C series pilot relief valve has higher working pressure and stronger flow capacity. This valve can be widely used in hydraulic systems of lifting and transportation, construction machinery, engineering vehicles, machine tools, ships, metallurgy and other equipment.
Model Description
(1)DB=Pilot Throttling
(2)W=With solenoid reversing valve,None=Without solenoid valve
(3)None=Pilot operated valve Pilot valve without main valve core cartridge,C=(no diameter) pilot valve with main valve core cartridge,C=(specify diameter),*C without main valve body
(4)DN10,15,20,25,30
(5)A=Normally Closed,B=Normally Open
(6)G=Pipe connection,None=Base plate installation
(7)1=handle,2=Set screw with external hexagon and protective cover,3=Lockable handle
(8)50=50 series
(9)C=Chuangli Hydraulic Technology
(10)50=Adjust The Pressure To 5MPa
100=Adjust The Pressure To 10MPa
200=Adjust The Pressure To 20MPa
315=Adjust The Pressure To 31.5MPa
50=Adjust The Pressure To 35.0MPa
(11)None = Control oil internal control and internal exhaust,X = Control oil external control internal exhaust,Y = Control oil internal control and external discharge,XY=Control oil external control and external discharge
(12)U=Minimum set pressure See working curve,None=Standard type
(13)None = Without reversing valve,6A = Screw-on solenoid,6B=Screw-connected electromagnet (high performance electromagnet),6C=Threaded solenoid
(14)W220-50=AC power 220V, 50HZ;G24=DC power 24V;
W220R=220V DC solenoid, with built-in rectifier and frequency
Rate independent (voltage ≥ 100V only with Z5 plug)
(15)None=Without emergency operation button,N=With emergency operation button
(16)For electrical connection, see 6-diameter solenoid reversing valve separate connection
Z4=Direct plug according to DIN43650;Z5=Large right angle plug;Z5L=Large right angle plug with indicator light for centralized connection;D=Terminal box for plug PG16;DL=Junction box with threaded plug PG and indicator light;DZ=Junction box with right angle plug;DZL=Junction box with right angle plug and indicator light
(17)R10=Damping Φ1.0mm in the B hole of the reversing valve
(18)None=Imperial thread,2=Metric thread
(19)No=Mineral oil,V=Phosphate oil
(20)Other details of the text description
The DB/DBW 50 series pressure control valve is a pilot-operated relief valve. The DB type is used to limit the system pressure, while the DBW type is used to limit the system pressure and unload it with the help of a solenoid reversing valve.
The DB type relief valve consists of a main valve (1) with a main valve core assembly (3) and a pilot valve (2) with a pressure setting element.
DB/DBW type relief valve:
The control pressure of oil circuit A acts on the main valve core (3). At the same time, the pressure acts on the spring-loaded side of the main valve core (3) and the ball valve core (8) of the pilot valve (2) through the throttle holes (4), (6) and (7). If the pressure of oil circuit A exceeds the setting value of the spring (9), the pilot valve core (8) opens. The signal is drawn from the inside of oil circuit A through the control channels (10) and (6). The oil on the spring-loaded side of the main valve core (3) flows through the throttle hole (11) of the control channel (7) and the ball valve core (8) and flows through the spring chamber (12). From there, the oil returns to the oil tank from the inside through the control oil circuit (13) (DB-50C/... type); or returns to the outside through the control oil circuit (14) (DB...50C/...Y... type). The throttle holes (4) and (5) produce a pressure drop on the main valve core (3), thereby A and B ports are connected. Oil flows from A to B while keeping the set working pressure constant.
The relief valve can be unloaded or switched to a different pressure (second stage pressure) by means of remote control port "X" (15).
DBW type relief valve:
In principle, the function of this valve is the same as that of the DB valve. The unloading of the main valve core (3) is achieved by the action of the electromagnetic reversing valve (16).
Graphic symbol for control oil type
Overall and connection dimensions (plate connection)
Unit (mm)
| Type |
L1 |
L2 |
L3 |
L4 |
L5 |
L6 |
L7 |
L8 |
L9 |
B1 |
B2 |
ΦD1 |
O-rings for Ports A And B |
O-ring for Port Y |
| DB/DBW10 |
91 |
53.8 |
22.1 |
27.5 |
22.1 |
47.5 |
0 |
25.5 |
2 |
78 |
53.8 |
14 |
17.12×2.62 |
9.25×1.78 |
| DB/DBW20 |
116 |
66.7 |
33.4 |
33.3 |
11.1 |
55.6 |
23.8 |
22.8 |
10.5 |
100 |
70 |
18 |
28.17×3.53 |
9.25×1.78 |
| DB/DBW30 |
147.5 |
88.9 |
44.5 |
41 |
12.7 |
76.2 |
31.8 |
20 |
21 |
115 |
82.6 |
20 |
34.52×3.53 |
9.25×1.78 |
Hebei Ding'an Hydraulic Machinery Co., Ltd. is a professional company integrating the research, production and sales of hydraulic valves. It is an ISO9001:2000 quality management system certified enterprise. The company currently has fixed assets of more than 10 million yuan, covers an area of 16,000 square meters, has strong technical force, and has more than ten years of experience in the development and production of hydraulic valves. It can quickly and high-quality develop various mining and engineering machinery hydraulic valves according to customer requirements.
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