LHW-3P

Load Holding Valve Winch

with pressure valve

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Table of Content

General Description ............................................................................................................................................................................. 2

1.1 Applications ............................................................................................................................................................................................ 2

1.2 Mounting Location (Recommendation) .................................................................................................................................................. 2

1.3 Function ................................................................................................................................................................................................. 2

1.4 Characteristics ....................................................................................................................................................................................... 2

2 Technical Data ...................................................................................................................................................................................... 3

3 Ordering Information ........................................................................................................................................................................... 4

3.1 Type Code ............................................................................................................................................................................................. 4

3.2 Currently available Versions .................................................................................................................................................................. 4

4 Description of Features according to Type Code ............................................................................................................................. 5

4.1 Feature 1: Design .................................................................................................................................................................................. 5

4.2 Feature 2: Connection Ports .................................................................................................................................................................. 5

4.3 Feature 3: Spool .................................................................................................................................................................................... 5

4.4 Feature 4: Pressure Setting ................................................................................................................................................................... 5

4.5 Feature 5: Activation .............................................................................................................................................................................. 5

4.6 Feature 6: Damping System .................................................................................................................................................................. 5

4.7 Feature 7: Opening pressure ................................................................................................................................................................. 6

4.8 Feature 8: Directional valve for mechanical brake ................................................................................................................................. 6

5 Installation ............................................................................................................................................................................................ 7

5.1 General Instructions ............................................................................................................................................................................... 7

5.2 Connection Proposal .............................................................................................................................................................................. 7

5.3 Mounting - Installation Space ................................................................................................................................................................. 7

5.4 Setting the pressure relief for the attachment ........................................................................................................................................ 7

5.5 Feature 7: Adjustment of opening pressure ........................................................................................................................................... 8

5.6 Dimensions Size SAE ¾” ....................................................................................................................................................................... 8

5.7 Dimensions Size SAE 1¼” ..................................................................................................................................................................... 9

6 Notes, Standards and Safety Instructions ....................................................................................................................................... 10

6.1 General Instructions ............................................................................................................................................................................. 10

6.2 Standards ............................................................................................................................................................................................. 10

6.3 Safety requirements ............................................................................................................................................................................. 10

LHW-3P

Load Holding Valve Winch

with pressure valve

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1 General Description

If loads are to be raised and lowered using hydraulic winch drives, a load holding valve should be installed on the winch motor for safety rea-

sons.

Load holding valves are suitable for motor and cylinder applications. They guarantee a leak-free locking of the consumer. The opening is not

effected by the load pressure and is controlled by opposing side pressure. This prevents the consumer from getting ahead of the incoming

volume flow. The load holding valves are suitable for applications that are subject to vibration, such as e.g. winch drives and are character-

ized by their high sensitivity and the direct joystick response.

Load holding valves of design 3P are equipped with a pressure relief valve, which restricts the maximum pressure on the consumer.

Advantages

 Quick installation

 Optimal dampening for tough application

 Adapting the dampening characteristics does not influence the start of opening

1.1 Applications

The WESSEL Load Holding Valve Winch enables low-loss load lifting by a check valve. The valve prevents any fast movement caused by the

load as opposed to the incoming oil flow. The load can be retained without any oil leaking and lowering is controlled.

1.2 Mounting Location (Recommendation)

The Load holding valve Winch is flanged with port B directly onto the hydraulic winchmotor.

1.3 Function

The lifting-line from the winch control valve is connected to port A (lifting )

of the load holding valve.

The lowering-line is directly connected to the winch motor. This line is also

connected to the port X as a signal line to start the lowering operation..

For lifting the load , the volume flow is directed from port A through a check

valve to the winch motor. In the idle position the load is locked leak-free. To

lower the load , the valve is opened by the rising pressure in X. The initial

opening is adjustable. The lowering of the load is very sensitive and inde-

pendent of load pressure. Thus prevents driving loads faster than the in-

coming oil flow permits. The damped activation of the valve ensures a vi-

bration- free operation.

The valve is provided with a pressure valve which limits the maximum

pressure at the consumer. It is important to note that the specified pressure

corresponds to the opening pressure of the pressure valve. Make sure that

the return line only has a low back pressure even at higher flow rates.

1.4 Characteristics

 Oscillation-free load lowering

 Extremely precise and fine characteristics, especially with lower speeds

 Leakage free load locking

 Robust valve construction with redundant spring system ensures the greatest safety

 Pressure relief function for winch connection

LHW-3P

Load Holding Valve Winch

with pressure valve

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2 Technical Data

Criteria Unit Value

A, B

SAE ¾“ SAE 1¼ “

(DIN ISO 6162-2, SAE J518/2 (CODE62))

Max. operating pressure bar 420

Pressure setting See type code feature 04: Pressure setting

Max. volume flow See type code feature 03: Spool

Weight kg 6,2 12,2

Connection Connection sizes Maximum Pressure

SAE ¾“ SAE 1¼ “

X, MVSt G ¼ ISO 1179-1

350

MA, MB, B-1 M8x1 G ¼ ISO 1179-1 bar 420

T G ¼ ISO 1179-1

< 1 bar

Installation position any

Hydraulics

Hydraulic fluid Mineral oil (HL, HLP) conforming with DIN 51524, other fluids upon request

Hydraulic fluid temperature range -20 – +80 °C

Environmental temperature: < +50 °C

Viscosity range 2,8 – 500 mm2/s

Contamination grade

Filtering conforming with NAS 1638, class 9, with minimum retention rate

≥75

LHW-3P

Load Holding Valve Winch

with pressure valve

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3 Ordering Information

3.1 Type Code

LHW 3P

HYP03B

00 01 02 03 04 05 06 07 08

Product group LHW

Design standard 3P

Connection(s) motor / cylinder ISO 6162-2 (SAE J518 Code62) metric

SAE ¾“ 05C

SAE 1 ¼“ 05G

Spool

Design of the spool optimized for the specified volume

flow. Specifications in l/min

SAE ¾“ 200

SAE ¾“ 250

SAE ¾“, SAE 1 ¼“ 300

SAE ¾“,SAE 1 ¼“ 350

SAE 1 ¼“ 400

SAE 1 ¼“ 500

SAE 1 ¼“ 600

Pressure setting opening level pressure valve at 10 l/min in bar, 150bar to 420bar XXX

Activation Hydraulically proportional

HYP03B

Damping (orifice selection)

minor damping 01

medium damping 02

strong damping 03

Opening pressure Pressure at port X, Standard 16 bar = 016 XXX

Directional valve for mechani-

cal brake

unavailable 0

XXX – fixed features XXX – customer selectable features  available  not available

Some theoretical configurations might be not feasible for technical reasons. For relating questions please ask for our advice.

3.2 Currently available Versions

The versions listed below are available standard-versions. Further versions in the range of the above mentioned features are available on

request.

Designation Type Code Part Nr

LHW-3P SAE3/4 CD62 350LPM 250BAR LHW -3P -05C -350 -250 -HYP03B -01 -014 -0 536.060.008.9

LHW-3P SAE3/4 CD62 200LPM 420BAR LHW -3P -05C -200 -400 -HYP03B -01 -014 -0 536.060.016.9

LHW-3P SAE11/4 CD62 500LPM 420BAR LHW -3P -05G -500 -420 -HYP03B -01 -015 -0 538.060.005.9

LHW-3P SAE3/4 CD62 200LPM 420BAR LHW -3P -05C -200 -420 -HYP03B -03 -024 -0 536.060.022.9

LHW-3P SAE1 1/4 CD62 300LPM 420BAR LHW -3P -05G -300 -420 -HYP03B -03 -024 -0 538.060.012.9

LHW-3P SAE1 1/4 CD62 400LPM 150BAR LHW -3P -05G -400 -150 -HYP03B -03 -017 -0 538.060.022.9

LHW-3P

Load Holding Valve Winch

with pressure valve

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4 Description of Features according to Type Code

4.1 Feature 1: Design

Design of the valve with an additional pressure valve for the protection of the winch motor

4.2 Feature 2: Connection Ports

The Load holding valve Winch is flanged with port B directly onto the hydraulic winchmotor. The lowering-line from the main control valve is

directly connected the winch motor also to the piloting port X of the load holding valve.

4.3 Feature 3: Spool

4.4 Feature 4: Pressure Setting

The pressure limiting valve is used for cutting down the dynamic load on the motor caused by pressure spikes. Make sure to always set that

valve sufficiently higher than the maximum operating pressures. Pressure limiting valves have a hysteresis: Be aware that the pressure limit-

ing valve closes at a lower pressure than the adjusted opening point. Otherwise this can lead to an uncontrolled lowering when the pressure

relief function is actuated with loads close to the opening point of the valve.

4.5 Feature 5: Activation

The valve is only activated externally for lowering operation. Therefore a pressure signal which is divided from the lowering line pilots the load

holding valve at port X.

For lifting the load the flow is directed from port A via a check valve to the winch with low losses. In idle position the load is locked without any

leakage. To lower the load the valve is opened by increasing pressure at port X.

4.6 Feature 6: Damping System

Inlet and outlet orifices dampen the opening speed of the brake. WESSEL

brake valves are additionally equipped with a stroke-dependent damping

system:

Small openings (range 1) with low damping are realized via an additional

drain orifice. The further opening (range 2) is made with progressively

increasing damping characteristics. A check-valve (CV 2) guarantees that

the valve closes quickly.

minor damping medium damping strong damping

LHW-3P

Load Holding Valve Winch

with pressure valve

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4.7 Feature 7: Opening pressure

The valve is opened by the motor inlet pressure (lowering pressure).

The opening point defines the pressure which opens the leakage free seat valve. For WESSEL load holding valves the opening point is inde-

pendent of the load pressure!

4.8 Feature 8: Directional valve for mechanical brake

Load holding valves of the design 3P have not provided any signal output for a mechanical brake and do not come with a switching valve for

mechanical brakes.

LHW-3P

Load Holding Valve Winch

with pressure valve

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5 Installation

5.1 General Instructions

 Observe all installation and safety information of the construction machine manufacturer.

 Only technically permitted changes are to be made on the construction machine.

 The user has to ensure that the device is suitable for the respective application.

 Application exclusively for the range of application specified by the manufacturer.

 Before installation or deinstallation, the hydraulic system is to be depressurized.

 Settings are to be made by qualified personnel only.

 Opening is only to be performed with the approval of the manufacturer, otherwise the warranty is invalidated.

 The included connection recommendations are not guaranteed. The functionality and the technical specifications of the construction

machine must be checked.

5.2 Connection Proposal

1 Pump

2 Main control valve

3 Pilot control unit

4 Load holding valve

5 Winchmotor

5.3 Mounting - Installation Space

 Observe the connection designations

 Observe the strength category and recommended torques (see appendix) of the fastening bolts

 Do not damage seals and flange surfaces

 The air must be exhausted from the hydraulic system

 Valve is mounted on the hydromotor by means of 4x cylinder head screws 8.8

5.4 Setting the pressure relief for the attachment

a. Undo the counter-nut (1).

b. Set screw (2) – 1mm = 83 bar

c. Factory pressure valve setting (please see type code)

d. Tighten the counter-nut (1)

SAE Thread A Thread depth B Torque Nm

SAE CODE 62

¾“ M10 71,5 49

1 ¼“ M14 93,5 135

LHW-3P

Load Holding Valve Winch

with pressure valve

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5.5 Feature 7: Setting the opening pressure

CAUTION!

The opening point of the load holding valve is specified in Feature 7, adjusted at port X. Due to the pressure dividing function the pressure at

MVSt is at a level than specified in Feature 7.

Changes to the settings are only to be performed by authorized and trained personnel. The user is responsible for any changes

made to the valve.

A setting under 13 bar is not permitted, measured at MVSt.

ATTENTION

During operation, the valve can heat up to the oil

temperature.

 Remove seal (factory status).

 Loosen the AF10 (1) counternut, left-hand thread

(Locknut completely screw out at ¾” + 1” version)

 The opening start of the hose rupture valve must be

approximately 0.5 bar above the opening start of the

main control unit spool.

 Increase: Turn the set-screw AF8 (2) clockwise.

 Decrease: Turn the set-screws AF8 (2) counter-clockwise.

 An adjustment of 1mm thread corresponds a variation of the opening pressure fo 2,9 bar.

 Tighten the counternut AF10 (1).

5.6 Dimensions Size SAE ¾”

LHW-3P

Load Holding Valve Winch

with pressure valve

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5.7 Dimensions Size SAE 1¼”

LHW-3P

Load Holding Valve Winch

with pressure valve

Subject to Modifications Version: LHW-3P_02E.doc 10/10

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6 Notes, Standards and Safety Instructions

6.1 General Instructions

 The views in drawings are shown in accordance with the European normal projection variant

 A comma ( , ) is used as a decimal point in drawings

 All dimensions are given in mm

6.2 Standards

The following standards are to be observed because of the surface temperatures on the valve:

 EN 563, Temperatures on surfaces that can be touched.

 EN 982, Safety-technical requirements for fluid-technical systems and their components.

6.3 Safety requirements

 WESSEL-HYDRAULIK GmbH guarantees utilization of standard and proven safety principles in accordance with ISO 13849-2: 2003,

Tables C.1 and C.2 for the construction of the valve described here.

 WESSEL-HYDRAULIK GmbH has a certified quality management system in accordance with DIN EN ISO 9001.

 The MTTFd value can be adopted from machine manufacturers with 150 years of experience for the described valve!

 Note: The user is therefore responsible for complying with the fundamental and proven safety principles according to

ISO 13849-2: 2003, Tables C.1 and C.2 for the implementation and operation of the hydraulic component!