PRESSURE CONTROLS

TR04-B20 Thermal Relief Valve

USASI/ISO:

SYMBOLS

6.300.1

DESCRIPTION

A screw-in, cartridge-style, poppet-type, thermal relief valve intended to prevent

cylinder damage resulting from temperature induced pressure intensiﬁ cation.

This valve is not intended to be used as a dynamic relief valve, or as protection

against load-induced pressure spikes.

OPERATION

The TR04-B20 blocks ﬂ ow from ➀ to ➁ until sufﬁ cient pressure is present at ➀ to

force the spring opposed poppet from its seat.

Pressure at port

➁ should not, at any time, be more than 500 psi above the pressure

at port

➀.

FEATURES

• Miniature size.

• Hardened parts for long life.

• Below surface mount.

• Low Leakage.

RATINGS

Maximum Operating Pressure: 414 bar (6000 psi)

Leakage: 1 drop/minute to 90% of crack setting

Reseat Characteristic: 10 drops/minute at 85% of pressure setting

Temperature: -40 to 120°C with Buna N seals

Filtration: See page 9.010.1

Fluids: Mineral-based or synthetics with lubricating properties at viscosities of

7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1

Installation: No restrictions; See page 9.020.1

Cavity: VC04-B2; See page 9.104.1

Cavity Tool: CT04-B3xx; See page 8.600.1

Seal Kit: SK04-B2x-B; See page 8.650.1

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DIMENSIONS

MATERIALS

Cartridge: Weight: 0.05 kg. (0.12 lbs.)

Steel with hardened work surfaces.

Zinc-plated exposed surfaces.

Buna N O-rings and TFE back-ups

standard, Polyurethane optional.

TO ORDER

Spring Setting

40 276 to 286 bar

(4000 to 4150 psi)

52 359 to 369 bar

(5200 to 5350 psi)

60 414 to 424 bar

(6000 to 6150 psi)

TR04-B20 - 0 - __ - __ __

Seals

N Buna N (Standard for Spring Setting 40)

V Fluorocarbon (Optional for Spring Setting 40)

P Polyurethane (Standard for Spring Settings 52 and 60)

TR04-B20

6.300.2

7/16–20UNF–2A THREAD

1/4" HEX

0.98

24.9

0.28

7.1

INCH

MILLIMETRE

HEX SOCKET

TORQUE –

4 to 5 ft-lbs

(5.4 to 6.7 Nm)

Max.

Non-standard spring

settings are available

for OEM applications.

Consult factory.

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