E 5.997.1/01.13

120

Pressure Relief Valve

Spool Type, Pilot-Operated

With Remote Control Option

Metric Cartridge – 350 bar

DB12121PF-01

Up to 200 l/min

Up to 350 bar

FEATURES

z External surfaces zinc-plated and corrosion-proof

z Hardened and ground control spool to ensure minimal wear and extended service

life

z Various pressure ranges up to 350 bar

z Quick response

z Increased operating reliability due to protective strainer

z Low hysteresis and excellent stability throughout the ow range

z Compact design enables space-saving installation in connection housings and

control blocks

z Valve can be operated via its remote control line in combination with a directional

valve

FUNCTION

SPECIFICATIONS

Operating pressure: max. 350 bar

Nominal ow: max. 200 l/min

Operating pressure ranges: up to 35 bar

up to 60 bar

up to 125 bar

up to 230 bar

up to 345 bar

Required remote control ow rate: 0.2 l/min to 0.6 l/min

(depending on pressure and ow rate)

Internal leakage: 320 cm³/min at 350 bar

Media operating temperature range: min. -30 °C to max. +120 °C

Ambient temperature range: min. -20 °C to +80 °C

Operating uid: Hydraulic oil to DIN 51524 Part 1 and 2

Viscosity range: min. 10 mm²/s to max. 420 mm²/s

Filtration: Class 21/19/16 according to ISO 4406 or

cleaner

MTTF

: 150 years (see "Conditions and

instructions for valves" in brochure 5.300)

Installation: No orientation restrictions

Material Valve body: high tensile steel

Spool: hardened and

ground steel

Seals: NBR (standard)

FKM (optional, media

temperature range

-20 °C to +120 °C)

Back-up rings: PTFE

Coil: steel / polyamide

Cavity: 12121

Weight: 0.26 kg

The pressure relief valve DB12121PF

is a pilot operated, spool valve with a

remote control option via the additional

port 3.

If the pressure across port 1 exceeds

the pre-set value, the pilot-stage opens

and oil ows from behind the main spool

to the tank port 2. The resulting pressure

differential allows the main spool to lift

against the reset-spring and allows oil

to ow from port 1 to port 2. Additionally

the valve may switch the system to

unpressurized ow by draining a ow

over port 3.

E 5.997.1/01.13

121

DIMENSIONS

PERFORMANCE

Pressure

Flow rate

Measured at

ν = 34 mm²/s,

Toil = 46 °C

thick

through

SW 32

torque 50

+10

SW 13

int. hex.

SW 4

MODEL CODE

DB 12121 - PF - 01 - C - N - 350 V 230

Basic model

Pressure relief valve

metric

Cavity

12121 = 3-way cavity

Function

PF = pilot operated,

with remote control option

Type

01 = standard

Body and ports*

C = cartridge only

Seals

N = NBR (standard)

V = FKM

Pressure range

035 = up to 35 bar

060 = up to 60 bar

125 = up to 125 bar

230 = up to 230 bar

350 = up to 350 bar

Type of adjustment

V = Allen head (hex. 5/32")

H = knob adjustment

F = xed setting

Other adjustment types on request

Opening pressure setting

No details = no setting, spring relaxed

Pressure value = opening pressure specied by customer

Standard models

Model code Mat.-Nr.

DB12121PF-01-C-N-060V 3126912

DB12121PF-01-C-N-230V 3126914

DB12121PF-01-C-N-350V 3126915

*Standard in-line bodies

Code Part No. Material Ports Pressure

R12121-01X-01 3130704 Steel, zinc-plated G3/4, G3/8 420 bar

Seal kits

Code Material Part No.

SEAL KIT 12121-NBR NBR 3269389

SEAL KIT 12121-FKM FKM 3269390

millimeter (inch)

subject to technical modications

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: utec@hydac.com

NOTE

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 modications.

CAVITY

12121

min. tting depth

millimeter

subject to technical modications

Form tools

Tool Part No.

Form tool 162128

Reamer 175021