Hydraulic Pressure Control Val ves - Cairo Hydraulic Group webtec/HYDRAULICS/Hydrulic... · Webtec...

Webtec Products Limited

Quality Hydraulic Components from the Webtec Range

Hydraulic Pressure

Control Valves


CONTENTS

DESCRIPTION PAGE No.

RV 020 Direct In-Line Relief Valve 1

RV 025Pressure Relief Valve 3

RV 050Pressure Relief Valve 5

RV 5 Pressure Relief Valve 7

RV 125 Pressure Relief Valve 9

PC 75Pressure Relief Valve 11

CLRVP 51 Cross Line Relief Valve 13

1

RV 020

Direct In-lineRelief Valve

PRESSURE RELIEF VALVES limit the maximumworking pressure of a hydraulic system to a pre-determined rating thus providing protection against theoverloading of system components.

Direct acting relief valves unload flow to tank whensystem pressure is sufficient to compress a springwhich unseats a poppet. They have a high tolerance tocontamination and are generally used for low flow rateswhere precise pressure control is not critical.

SpecificationsMaximum Pressure:

210 bar

Maximum Flow:20 lpm

Porting:see Table 1, ordering codes

Material:steel components in High Tensile Aluminium body

Weight:0.060 kg

Symbol


Features● Direct acting in-line relief valve giving high

tolerance to particle contamination.

● Quick response provides protection against shockloads.

● Relief pressure is factory set to customerrequirements within a range between 20 - 210 bar.

● Straight through porting allows the valve to beconnected directly in-line * thus making the bestuse of restricted space.

● Provides protection against thermal expansion offluids.

*with a T piece.

2


ORDERING CODES Typical Code RV020 150 J A

RV020 - Valve Type

Relief Pressure Setting in barbetween 20 - 210 bar

Porting (Table 1)

A - Design Standard

Table 1: Inlet Porting

TYPICAL CHARACTERISTICS(at one pressure setting)

Curve established using hydraulic mineral oil with viscosity of 27.4 centistokes at 49°C

Code Port Threads

A 3/8” - 18 NPTF (Only applies for inlet thread)

J 3/8” BSPF (Parallel)

0 5 10 15 20

20

40

60

80

100

120

140

160

180

200

Flow (lpm)

Pre

ssu

re (

bar

)

INSTALLATION DETAILSDimensions in millimetres

Return To Tank

3/8” Male Inlet(Internal cone on BSPF version)

3/8” - 18 NPSM Outlet Thread

PressureInlet

15.9 63.5 22.2

3

RV 025

Pressure Relief Valve




210 bar

Maximum Flow:23 lpm


Material:steel components in high tensile aluminium body

Weight:0.25 kg

Symbol


Features● Direct acting, in-line relief valve giving high

tolerance to contamination.


● Relief pressure is adjustable by means of a screwand locknut. See Table 1, ordering codes foravailable adjustment ranges.

● Provides protection against thermal expansion offluid.

● Can be used as a remote control for a pilotoperated relief valve by substituting for the built indirect acting relief valve of the pilot operated valve.

● Flow through pressure and tank ports enable thevalve to be connected in-line with mountingversatility and convenience.

Pressure Tank

TankPressure

4


28.5

96.8

Return Ports

Pressure Ports

20.6

27

50.8

63.5

ORDERING CODES Typical Code RV025 3 J

RV025 - Valve Type

Adjustment Range (Table 1)

Porting (Table 2)

Table 1: Adjustment Range Table 2: Porting

TYPICAL CHARACTERISTICS(at one Pressure settings)

Curve established using hydraulics mineral oil with viscosity 27.4 centistokes at 49°C

00

5 10

40

80

120

160

200

15 20 25Flow (lpm)

Inle

t P

ress

ure

(b

ar)


Code Port Threads

I 9/16” - 18 UNF

J 3/8” BSP

Code Range

1 10 - 27 bar

2 27 - 70 bar

3 70 - 103 bar

4 103 - 180 bar

5 180 - 210 bar

5

RV 050



Direct acting relief valves unload flow to tank whensystem pressure is sufficient to compress a springwhich unseats a poppet. They provide high tolerance tocontamination and are generally used for low flow rateswhere precise pressure control is not critical.


210 bar

Maximum Flow:50 lpm

Porting: see Table 2, ordering codes

Material:steel components in high tensile aluminium body

Weight: 0.5 kg

Symbol


Features● Direct acting, in-line relief valve giving high



● Relief pressure is adjustable by means of a screwand locknut. See Table 1, ordering codes foravailable adjustment ranges.



● Flow through pressure ports enable the valve tobe connected in-line with mounting versatility andconvenience.

Pressure

Pressure

Tank

6


76.2

63.5 38.1

95.2

28.6

31.7

ReturnPort

PressurePort

Remove cap for screwdriver adjustment

ORDERING CODES Typical Code RV050 I J S

RV050 - Valve Type


Porting (Table 2)

Adjustment Method (Table 3)

Table 1: Adjustment Range Table 2: Porting Table 3: Adjustment Method

TYPICAL CHARACTERISTICS(at one Pressure Setting)

Curve established using hydraulic mineral oil with viscosity of 27.4 centistokes 49°C

00

10

40

80

120

160

200

20 30 40 50

Flow (lpm)

Inle

t P

ress

ure

(b

ar)

Code Port Threads

1 10 - 103 bar

2 14 - 210 bar

Code Adjustment

S Screwdriver

K Knob

Code Port Thread

I 3/4” - 16 UNF

J 1/2” BSP

INSTALLATION DETAILSDimensions in Millimetres

19

66 m

ax

Knob Adjustment

7

RV 5





276 bar

Maximum Flow:70 lpm

Porting:3/4” BSP

Material:steel cartridge in high tensile aluminium body.

Weight: 0.75 kg

Symbol


Features● Direct acting in-line relief valve giving high





● Flow through pressure ports enable the valve tobe connected in-line with mounting versatility andconvenience.

Pressure

Pressure

Tank

8


Pressure Port 3/4” BSP

64

79

Tank Port 3/4” BSP

8.7 dia Pressure Port 3/4” BSP

42

40

50

59

ORDERING CODES Typical Code RV5 120

RV5 - Valve Type

Pressure Setting in barbetween100 - 276 bar

0 15

40

80

120

160

200

30 45 60 750

Flow (lpm)

Inle

t P

ress

ure

(b

ar)


TYPICAL CHARACTERISTICS(at one Pressure Setting)


9

RV 125



Direct acting relief valves unload flow to tank whensystem pressure is sufficient to compress a springwhich unseats a poppet. Pilot operated valves have abuilt-in direct acting relief valve which, when opened bysystem pressure, causes a larger spool to movepermitting larger flow rates to return to tank. Pilotoperated relief valves provide more precise pressurecontrol than direct acting valves.


210 bar

Maximum Flow:125 lpm


Material: steel components in high tensile aluminium body.

Weight:1.05 kg

Symbol


Features● Cartridges are available providing either direct

acting for high tolerance to particularcontamination or pilot operation for quiet, smoothand accurate pressure control.

● Relief pressure is adjustable from 80 - 210 bar bymeans of a screw concealed by a cap unit.

● A gauge port is provided for the convenience ofthe user.

● Flow through pressure ports enable the valve tobe connected in-line with mounting versatility andconvenience without causing restriction.

P TP

Direct Acting Pilot Operated

10


ORDERING CODES Typical Code RV125 PO J 100

RV125 - Valve Type

Cartridge Type (Table 1)

Porting (Table 2)

Pressure setting in barbetween 80 - 210 bar

Table 1: Cartridge Type Table 2: Porting

TYPICAL CHARACTERISTICS(at two pressure settings for both a direct acting and a pilot operated cartridge)


Code Description

PO Pilot Operated Cartridge

DA Direct Acting Cartridge

Code Description

J 3/4” BSP

G 1 1/16” - 12 UNF

(No 12 SAE ‘0’Ring Ports)

Direct Acting

Direct Acting

Pilot Operated

Pilot Operated

0

40

80

120

120

160

200

040 6020 80 100

Flow (lpm)

Inle

t P

ress

ure

(b

ar)

PressureReturn

153

64 51

Pressure Portsboth sides

Gauge Port1/4” BSP

51

25

19

70

121

Remove cap for access toscrewdriver adjustment.


11

PC 75

Pressure ReliefValve Pilot Operated


Pilot operated relief valve has built-in direct acting reliefvalves which unload flow to tank when system pressureis sufficient to unseat a spring loaded poppet. Flowthrough the direct acting valve causes a larger spool tomove allowing a larger flow to return to tank. Pilotoperated relief valves are generally used for higher flowrates where pressure control is required.


210 bar

Maximum Flow:135 lpm


Material:steel components in cast iron body Plastic handle

Weight:3.5 kg

Solenoid Voltage:see Table 3, ordering codes(solenoid optional)

Symbol


Features● Relief pressure is adjustable by means of a

rotating control handle. See Table 2, orderingcodes for adjustment ranges. Screwdriveradjustment is also available.

● Pilot operation provides quiet, smooth andaccurate pressure control.

● Remote pressure control can be obtained byplacing a secondary relief valve in a line to tankconnected to the vent port.

● Flow can be unloaded to tank at low pressureusing a venting (ex. needle) valve in a line to tankconnected to the vent port.

● Flow may be remotely unloaded to tank at lowpressure by using the optional solenoid operatedventing valve.

P T

12


ORDERING CODES Typical Code PC U 75 I Z C 12VDC NC J

PC - Pressure Control

Valve Function (Table 1)- omit if not required

75 - Valve Size

Pressure Range (Table 2)

Z - For 4.3 bar Unloading Spring- omit for Standard 0.7 bar Unloading Spring

C - Design Standard

Solenoid Voltage if Solenoid Venting is fitted (Table 3)

Solenoid Spool Position (Table 4)

Porting (Table 5)

Table 1: Valve Functions Table 2: Pressure Range Table 4: Solenoid Spool Position

Table 3: Solenoid Voltage Table 5: Porting

Code Port Thread

J 3/4” BSP

G 1 - 1/16 - 12 SAE

Code Description

U Pressure Unloading

V Solenoid Vent

Code Description

06 5 - 40 bar

1 2 - 69 bar

2 35 - 138 bar

3 104 - 207 bar

Code Position

NC Normally Closed

NO Normally Open

Code and Voltage

12 VDC

24 VDC

72.4

50.8

146

Pressure ConnectionBoth Sides

ReturnConnection

Gauge Connection1/4” BSPF

Unload Connection1/4” BSPF

85.7

107.

9


13

CLRVP 51

Cross Line Relief Valve

CROSS LINE RELIEF VALVES consist of relief valveswhich connect between the pressure and return lines ofa hydraulic actuator. This relieves shock pressuresbetween directional control valves and actuator's whenthe control valve is suddenly centred to stop flow. Whentwo relief valves are connected in opposite directionsbetween the pressure and return lines shock pressuresare relieved when control valves are suddenly reversedor centred while fluid is flowing in either direction.


210 bar

Maximum Flow:50 lpm

Porting: see Table 2, ordering codes

Material:steel components in cast iron body

Weight:2.8 kg

Mounting:2 bolt

Symbol


Features● Direct acting cross-line relief valve giving high

tolerance to particle contamination.

● Relief pressure is adjustable by means of a screwand lock nut. See Table 1, ordering codes foradjustment ranges.

● Pipe mounting enables the valve to be mountedin-line when manifold mounting is not possible orpractical.

Service Service

Pressure /Return

Pressure /Return

14


ORDERING CODES Typical Code CLRVP51 I J

CLRVP51 - Valve Type


Porting (Table 2)

Table 1: Adjustment Range Table 2: Porting

TYPICAL CHARACTERISTICS(at one pressure setting)


Code Range

1 10 - 103 bar

2 14 - 210 bar

Code Port Threads

G 3/4” - 16 UNF 2B ‘0’ Ring

J 1/2” BSP

00

10

40

80

120

160

200

20 30 40 50Flow (lpm)

Inle

t P

ress

ure

(b

ar)

101.6

136.5

508.7 diaMounting Holes

94.5

74.6

50.8


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Your Webtec Products representative:

Webtec Products Limited

Nuffield Road, St. Ives, Cambridgeshire, PE27 3LZ, UKTel: +44(0)1480 397400 Fax: +44(0)1480 466555

E-mail: [email protected] us at: www.webtec.co.uk

Webtec Products Limited reserve the right to make improvements and changes to the specification without notice.Certificate No.8242

Manufacturers of Hydraulic Components

and Test Equipment for the Mobile,

Industrial and Agricultural Industries

Hydraulic Pressure Control Val ves - Cairo Hydraulic Group webtec/HYDRAULICS/Hydrulic... · Webtec...

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