Pressure relief valve, pilot controlled DBW…W65

Description

• Size 10 … 25
• Component series 4X
• Maximum operating pressure 315 bar
• Maximum flow 300 l/min

Features

• For threaded connection
• 4 adjustment types for pressure adjustment, optionally
  • Rotary knob
  • Sleeve with hexagon and protective cap
  • Lockable rotary knob with scale
  • Rotary knob with scale
• 4 pressure ratings
• Solenoid-operated unloading via built-on directional spool valve
• CE conformity according to the Low-Voltage Directive 2014/35/EU for electrical voltages >50 VAC or >75VDC

Product description

Valves of type DBW are pilot-operated pressure relief valves. They are used for limitation and solenoid-actuated unloading of the operating pressure.

The valves basically consist of housing (1) and pilot control valve (2) with adjustment type.

The pressure applied to channel P acts on the main spool (3). Via the nozzle bores (4 and 5), the pressure is at the same time applied to poppet (6). If the pressure in channel P exceeds the value set at spring (7), poppet (6) opens against spring (7). Via the nozzle bores (4 and 5), the hydraulic fluid from channel P now flows into the spring chamber (8). From here, it is led into the tank internally (version "–"), via the control line (9 and 10), or externally (version "Y") via the control line (9 and 11).

Due to the state of equilibrium at the main spool (3), hydraulic fluid flows from channel P to channel T, maintaining the set operating pressure.

A pressure gauge connection (12) allows for the control of the operating pressure.

The pressure relief valve can be unloaded or switched to another pressure (second pressure rating) via port X (13).

The main spool (3) is unloaded by controlling a built-on directional valve.

Type code

Notice:

In case spare parts of the screw-in cartridge valve are required, always order type DB 20 K.-1X/.XY.

Technical data

general

hydraulic

Notice:

Technical data for directional spool valve see data sheet 23178.

(For applications outside these values, please consult us!)

Diagrams/characteristic curves

(measured with HLP46, ϑOil = 40 ±5 °C)

Inlet pressure dependent on the flow

Notices:

• The characteristic curves were measured with external, depressurized pilot oil return.

• Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port T.

Minimum set pressure and circulation pressure dependent on the flow

Standard version

Minimum set pressure and circulation pressure dependent on the flow

Version “U”

Notices:

• The characteristic curves were measured with external, depressurized pilot oil return.

• Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port T.

• The characteristic curves apply to an output pressure pT =0 bar in the entire flow range.

Symbols/Circuit diagrams

	"DBW…​–…"	"DBW…​X…"
Normally closed
Normally open
	"DBW…​Y…"	"DBW…​XY…"
Normally closed
Normally open

Dimensions

Dimensions in mm

Information

General information

• The relief function must not be used for safety functions.

• With version "B", the lowest adjustable pressure (circulation pressure) is set in case of power failure or cable break. With version "A", the pressure limiting function is set in case of power failure or cable break.

• Hydraulic counter pressures in port T with internal pilot oil return and/or port Y with external pilot oil return add 1:1 to the response pressure of the valve set at the pilot control.
  Example:
  Pressure adjustment of the valve by spring preload in the pilot control valve/adjustment type
  pspring = 200 bar
  Hydraulic counter pressure in port T with internal pilot oil return phydraulic = 50 bar
  => Response pressure = pspring + phydraulic = 250 bar

Accessories

Mating connectors for valves with connector “K4”, without circuitry, standard

3P Z4

Mating connectors for valves with connector “K4”, without circuitry, standard

3P Z4

• For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector”
• Mating connectors for valves with one or two solenoids (individual connection)

• Data sheet

• Spare parts and repair

Mating connectors for valves with connector “K4”, with indicator light

3P Z5L

Mating connectors for valves with connector “K4”, with indicator light

3P Z5L

• For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector”
• Mating connectors for valves with one or two solenoids (individual connection)

• Data sheet

• Spare parts and repair

Mating connectors for valves with connector “K4”, with indicator light and Zener diode suppression circuit

3P Z5L1

Mating connectors for valves with connector “K4”, with indicator light and Zener diode suppression circuit

3P Z5L1

• For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector”
• Mating connectors for valves with one or two solenoids (individual connection)

• Data sheet

• Spare parts and repair

Mating connectors for valves with connector “K4”, with rectifier

3P RZ5

Mating connectors for valves with connector “K4”, with rectifier

3P RZ5

• For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector”
• Mating connectors for valves with one or two solenoids (individual connection)

• Data sheet

• Spare parts and repair

Downloads

	Pressure relief valve, pilot-operated Data Sheet | RE25818 | 2021-10-01 | English, United States | PDF | 857k Product Groups: Pressure relief valves Type DB…W65; DBW…W65; DB 20 K
	Pressure relief valve, pilot-operated Manual | RE25818-B | 2021-11-01 | English | PDF | 404k Product Groups: Industrial Hydraulics Type DB20K.1X/...E