EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 E-350.A

An Eaton Brand

Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.

Ratings and Specifications

Figures based on: Oil Temp = 40° C Viscosity = 32 cSt (150 SUS)

Rated flow 200 L/min (52 USgpm)

Max setting 350 bar (5000 psi)

Differential unload/reload 10-15%

Cartridge material Working parts hardened and ground steel.

External surfaces zinc plated.

Body material Standard steel

Mounting position Unrestricted

Cavity number A3145 (See Section M)

Torque cartridge into cavity 100 Nm (73 lbs ft)

Weight 1PUL200 0.74 kg (1.63 lbs)

1PUL250 6.8 kg (14.96 lbs)

Seal kit number 1PUL200 SK670 (Nitrile) SK670V (Viton

)

1PUL250 SK452 (Nitrile) SK452V (Viton)

Recommended filtration level BS5540/4 Class 18/13 (25 micron nominal)

Operating temp -30°C to +90°C (-22° to 194°F)

Leakage 35 milliliters/min @ 210 bar

Nominal viscosity range 5 to 500 cSt

Viton is a registered trademark of E.I. DuPont

1PUL200 - Relief/Unloading Valve

Spool, pilot operated

200 L/min (52 USgpm) • 350 bar (5000 psi)

Description

These unloader valves are

used to unload a pump, or

pumps, to tank when pressure

in a separate part of the circuit

reaches a pre-set level. The

valves will close, causing the

circuit to reload, when the

pressure drops to approximately

85% of the unload pressure.

The most common application

is to maintain a pressure in an

accumulator which may be used

in an emergency to operate an

essential hydraulic function. (Eg,

a brake circuit). The 1PUL**

valve has a drain port to ensure

correct valve function while

allowing the bypassed oil to

be used for a secondary circuit

requirement.

Operation

Inlet pressure is seen on the

nose of the valve and system

pressure (downstream of the

system check valve) operates

on the system pilot port. When

pressure rises to the valve

setting, the relief section opens

and the system pressure acts on

the pilot piston to hold the valve

in the open position.

The ratio between the pilot

piston diameter and the seat

diameter to the relief valve pilot

section ensures that the valve

will be maintained in the fully

open position until the system

pressure drops to approximately

85% of the unload pressure.

Features

Valves are available as cartridges

for installation into special line

bodies or into custom designed

Hydraulic Integrated Circuits.

(NOTE: Provision must be made

for a system check valve and a

pilot line to signal the system

pressure). Valve assemblies can

be supplied complete in a line

body for use in accumulator

circuits. Bodied valves include

a check valve and the required

connection from the system to

the valve pilot port.

Pressure Drop Curves

Performance Data

Sectional View

Pilot (4)

Drain (3)

Inlet (1)

Outlet (2)

Time - seconds

Typical valve performance

System working pressure

- psi

System working pressure

- bar

5800

5075

4350

3625

2900

2175

1450

725

400

350

300

250

200

150

100

0 1 2 3 4 5

EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 E-351.A

An Eaton Brand

Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.

4 Pressure Range

@ 4.8 L/min

Note: Code based on pressure

in bar.

20 - 30-210 bar.

Std setting 100 bar

- 50-350 bar.

Std setting 200 bar

5 Seals

S -

Nitrile (For use with most

industrial hydraulic oils)

SV -

Viton (For high temperature

and most special ﬂuid

applications)

6 Body Material

377 - Steel

Omit for aluminium (up to 210 bar)

Cartridge Only

Basic Code

1PUL200

1PUL*** P 8W 35 S 377

1 2 3 4 5 6

1PUL200 - Relief/Unloading Valve

Spool, pilot operated

200 L/min (52 USgpm) • 350 bar (5000 psi)

Model Code

3 Port Sizes - Bodied Valves Only

1 Basic Code

1PUL200 - Cartridge Only

1PUL250 - Cartridge and Body

2 Adjustment Means

P - Leakproof Screw

Adjustment

- Tamperproof Cap

(See page 12-102 for dimensions)

Complete Valve

1" Port

Basic Code

1PUL250

With System Check

Code Port Size Housing Number - Sub Assembly

Aluminium Steel

8W 1" BSP 1/4" BSP Drain Port BXP23466-8W-S-377

16T 1" SAE 1/4" SAE Drain Port BXP23466-16T-S BXP23466-16-S-377

49.0

(1.90)

max

Hex socket adjust

4.0 A/F

17.0 A/F

38.1 A/F

1-5/16-12 UNS

Pilot (4)

Inlet (1)

81.0

(3.19)

Drain (3)

Outlet (2)

Dimensions

mm (inch)

Note: For applications above

210 bar please consult our

technical department or use

the steel body option.

– – –

189.0

(7.44)

max

2 holes

Ø11.0

(0.43) thro’

9.0

(0.35)

max

6.0 (0.24)

max

101.6 (4.00)

50.8 (2.00)

25.4 (1.00)

34.0

(1.34)

100.0

(3.94)

140.0

(5.51)

15.0 (0.59)

58.0

(2.28)

9.0

(0.35)

122.0

(4.80)

30.0 (1.18)

71.6 (2.82)

70.0

(2.76)

G 1/4 / 4T

2 (System)