PRODUCT ADVANTAGESFUNCTION

FUNCTION DESCRIPTION

Pressure relief valve

DBM12121PEY-01

•

For applications in systems which need to maintain a constant minimum

pressure to keep the consumer stable despite variable back pressures

acting on the valve

•

Independent of the outflow pressure → the set pressure value is

constantly maintained

•

With spring chamber relief at port 3

•

Low Δp

•

A factory-set, customer-specific pressure value of up to 350 bar is

possible

•

Various nominal sizes available on request

•

Exposed surfaces zinc-nickel plated for increased corrosion protection

(1,000 h salt spray test)

EN 5.194.6. 0/01.21

up to 200 l/min

up to 350 bar

with spring chamber relief

spool type, pilot-operated

Metric Cartridge – 350 bar

The pressure relief valve is a pilot-operated, spring-loaded spool valve. The

pressure limiting function is magnetically activated and has spring chamber

relief at port 3. Pressures at port 2 have no effect on the pressure setting.

When the solenoid is energised, its function is to limit pressure in the system.

If the inlet pressure at port 1 exceeds the pre-set value, the pilot stage opens

and a small amount of oil flows from behind the main spool to port 3. The

resulting pressure differential causes the main spool to move against its

return spring and allows oil to flow from port 1 to port 2. This continues until

the system pressure at port 1 is equal to the pre-set value of the pressure

spring and the pilot stage closes again. The return spring moves the main

spool to the closing position.

When the solenoid is de-energised, the pressure limiting function is

terminated and port 1 is connected to port 2. If there is still an inlet pressure

at port 1, i. e. oil is flowing to the consumer, the pressure build-up at the

consumer amounts to max. 10 bar.

Note

A small amount of pilot oil must be able to drain off at port 3. Pressure at port

3 adds to the setting pressure.

SPECIFICATIONS*

DIMENSIONS

Millimetre (inch)

Subject to technical modifications.

*Torque:

Steel manifold (tensile strength > 360 N/mm²): 105 Nm

Aluminium manifold (tensile strength > 330 N/mm²): 70 Nm

(With torque tool in acc. with DIN EN ISO 6789, tool type II

class A or B)

For more information see “Conditions and Instructions for

Valves” in brochure 53.000

EN 5.194.6. 0/01.21

Operating pressure max. 350 bar

Pressure setting ranges 10 to 60 bar

10 to 100 bar

10 to 230 bar

10 to 350 bar

Flow rate max. 200 l/min

Internal leakage < 0.6 l/min. at 80% of p

nom

Media operating temperature range NBR: min. -30 °C to max. +100 °C

FKM: min. -20 °C to max. +120 °C

Ambient temperature range NBR: min. -20 °C to max. + 60 °C

FKM: min. -20 °C to max. + 60 °C

Operating fluid Hydraulic oil to DIN 51524 Part 1, 2 and 3

Viscosity range min. 7.4 mm²/s to max. 420 mm²/s

Filtration

(to ISO 4406)

p ≤ 210 bar: min. class 20/18/15

p > 210 bar: min. class 19/17/14

MTTFd 150 – 1200 years, measurement according to DIN EN ISO 13849-1

Installation No orientation restrictions

Materials Valve body steel

Spool hardened and ground steel

Seals NBR (standard)

FKM

Back-up rings PTFE

Cavity 12121

Weight 0.55 kg

Electrical data

Type of voltage DC: DC solenoid

AC: AC solenoid with rectifier integrated into the coil

Voltage tolerance ± 15% of the nominal voltage

Coil resistance 30 Ω (12 V)

8 Ω (24 V)

Coil duty rating Continuous up to

max. 115 % of the nominal voltage at 60 °C ambient temperature

Coil type 40-1836

* see “Conditions and Instructions for Valves" in brochure 53.000

Plastic cap to protect the set

pressure available as an option

All connector types are

possible

8 HEX

Torque max. 2.5 Nm

13 HEX

Torque 8 Nm

Torque 4.5 Nm

After loosening the mounting

nut, the coil can be rotated

through 360° and removed.

32 HEX

Torque *

CAVITY

12121 metric

VE = Visual Examination

* Permitted drilling zone (for manifold design)

** Sharp edges should be avoided by rounding to a radius of 0.1 mm to 0.2 mm

*** Largest pre-drilling diameter (nominal tool diameter)

Millimetre (inch)

Subject to technical modifications.

EN 5.194.6. 0/01.21

MODE CODE

DBM12121PEY - 01 - C - N - 350 V 350 - 24 DG §0504

Basic model

Pressure relief valve, metric

Type

01 = standard

Body and ports

C = cartridge only

Sealing material

N = NBR (standard)

V = FKM

Pressure ranges

60 = 10 to 60 bar

100 = 10 to 100 bar

230 = 10 to 230 bar

350 = 10 to 350 bar

Type of adjustment

V = adjustable using tool (standard)

C = with seal cap (only with coil)

Other types of adjustment on request

Max. setting pressure

350 = 350 bar (factory-set setting tolerance ± 3% of the max. pressure range)

Note: Setting pressure 50% to 100% of the pressure range

Coil voltage

12 = 12 V (30 Ω)

24 = 24 V (8 Ω)

Coil connectors (40-1836)*

DC: DG = DIN connector design A to EN 175301-803

DK = KOSTAL threaded connection M27x1

DL = 2 flying leads, 457 mm long; 0.75 mm²

DN = Deutsch connector, 2-pole, axial

DT = AMP Junior Timer, 2-pole, radial

AC: AG = DIN connector design A to EN 175301-803

*see “Solenoid coils for directional valves” in brochure 5.207

Orifice

Internal version identification code

EN 5.194.6. 0/01.21

The information in this brochure relates to the operating conditions and applications described.

For applications or operating conditions not described, please contact the relevant technical department.

Subject to technical modifications.

HYDAC Fluidtechnik GmbH

Justus-von-Liebig-Str.

D-66280 Sulzbach/Saar

Tel: 0 68 97 /509-01

Fax: 0 68 97 /509-598

E-Mail: valves@hydac.com

TYPICAL PERFORMANCE

MATERIAL OVERVIEW

NOTE

measured at 41 mm²/s and T

oil

= 42°C

Standard models

Model code Part no.

DBM12121PEY-01-C-N-060V-0 4439873

DBM12121PEY-01-C-N-100V-0 4439874

DBM12121PEY-01-C-N-230V-0 4408044

DBM12121PEY-01-C-N-350V-0 4439895

Other versions on request

Spare parts, seal kits

Code Material Part no.

FS METRISCH 12121/N NBR 3651335

FS METRISCH 12121/V FKM

4080086

Accessories, standard in-line bodies

Code Material Ports Pressure Part no.

R12121-01X-01 Steel, zinc-plated G3/4“, G3/8“ 350 bar 3130704

Other standard in-line bodies on request

Accessories, form tools for cavity

Tool Part no.

KK-Countersink 177317

Reamer 175021

Flow [l/min]

Pressure [bar]

EN 5.194.6. 0/01.21