LHW-4N; LHW-4P. LHW-4T

Load Holding Valve Winch

1 ¼”

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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, design 4P and 4T ..................................................................................................................................... 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 (only 4P, 4T) .................................................................................................................. 7

5.5 Feature 7: Setting the opening pressure ................................................................................................................................................ 8

5.6 Dimensions Size SAE 1 ¼” .................................................................................................................................................................... 8

6 Notes, Standards and Safety Instructions ......................................................................................................................................... 9

6.1 General Instructions ............................................................................................................................................................................... 9

6.2 Standards ............................................................................................................................................................................................... 9

6.3 Safety requirements ............................................................................................................................................................................... 9

LHW-4N; LHW-4P. LHW-4T

Load Holding Valve Winch

1 ¼”

Subject to Modifications Version: LHW-4N; LHW-4P_ LHW-4T_00E.doc 2/9

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1 General Description

Load holding valves are suitable for motor and cylinder applications. 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 reasons.

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 characterized by their high sensitivity and the direct joystick response.

Load holding valves of design LHW-4P are equipped with a pressure relief valve, which restricts the maximum pressure on the consumer.

Valves of design LHW-4T are also equipped with a pressure relief valve, which is connected to an additional tank line. This valve shall pre-

vent pressure peaks by leading only small flow to the tank.

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.

It is also possible to use it for cylinder applications.

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 con-

nected 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 ad-

justable. The lowering of the load is very sensitive and independent of load pres-

sure. Thus prevents driving loads faster than the incoming oil flow permits. The

damped activation of the valve ensures a vibration- free operation.

The valve design 4P is provided with a pressure valve which limits the maximum

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

responds to the opening pressure of the pressure valve. Make sure that the re-

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

The valve design 4T shall prevent pressure peaks which may be caused by dy-

namic effects. Only small flow is led directly to the tank.

The valve design 4N works without pressure relief function. This may increase

the safety of application! If a pressure valve is used and the operational pressure

does reach the opening pressure, the pressure relief valve opens and will not

close until the operational pressure is reduced.

When using design 4N the maximum operational pressure shall not reach maxi-

mum allowed pressure for valve or motor.

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 is available

LHW-4N; LHW-4P. LHW-4T

Load Holding Valve Winch

1 ¼”

Subject to Modifications Version: LHW-4N; LHW-4P_ LHW-4T_00E.doc 3/9

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2 Technical Data

Criteria

Value

maximum operating pressure B

420 bar

maximum operating pressure A

350 bar

maximum pilot pressure

350 bar

maximum recommended flow

600 l/min

pressure settings

see type code feature 04: Pressure setting

weight

12,5 kg

Connec-

tion

Connection sizes torque annotation

SAE1¼“

(DIN ISO 6162-2, SAE

J518/2 (CODE62))

180 Nm supply port

SAE1¼“

(DIN ISO 6162-2, SAE

J518/2 (CODE62))

180 Nm actuator port

X G ¼ ISO 1179-1 40 Nm pilot port

MA, MB,

MVSt

G ¼

ISO 1179-1 40 Nm measuring port

T G ¼ ISO 1179-1 40 Nm tank port

installation position any

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 β

≥75

LHW-4N; LHW-4P. LHW-4T

Load Holding Valve Winch

1 ¼”

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3 Ordering Information

3.1 Type Code

LHW 05G

HYP03B

00 01 02 03 04 05 06 07 08

Product group LHW

Design

standard, without pressure relief valve 4N

with pressure relief valve to control valve 4P

with pressure relief valve to tank 4T

Connection motor / cylinder ISO 6162-2 (SAE J518 Code62) metric SAE 1¼“ 05G

Spool Design of the spool optimized for the specified volume flow. Specifications in l/min

300

400

500

600

Pressure setting opening level pressure valve at 10 l/min in bar,150bar to 420bar only for 4P + 4T Version XXX

Activation Hydraulically proportional.

HYP03B

Damping (orifice selection)

minor damping 01

medium damping 02

strong damping 03

Opening pressure Pressure at port X, Standard 15 bar = 015 XXX

Directional valve for me-

chanical 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-4P SAE 1 ¼” CD62 500LPM 420BAR LHW -4P -05G -500 -420 -HYP03B -02 -015 -0 538.060.026.9

LHW-4N SAE1 ¼” CD62 300LPM LHW -4N -05G -300 -0 -HYP03B -02 -015 -0 538.060.027.9

LHW-4N SAE1 ¼” CD62 400LPM LHW -4N -05G -400 -0 -HYP03B -02 -015 -0 538.060.028.9

LHW-4N SAE1 ¼” CD62 500LPM LHW -4N -05G -500 -0 -HYP03B -02 -015 -0 538.060.029.9

LHW-4N SAE1 ¼” CD62 600LPM LHW -4N -05G -600 -0 -HYP03B -02 -015 -0 538.060.030.9

LHW-4P SAE1 ¼” CD62 300LPM 420BAR LHW -4P -05G -300 -420 -HYP03B -02 -015 -0 538.060.031.9

LHW-4N; LHW-4P. LHW-4T

Load Holding Valve Winch

1 ¼”

Subject to Modifications Version: LHW-4N; LHW-4P_ LHW-4T_00E.doc 5/9

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4 Description of Features according to Type Code

4.1 Feature 1: Design

LHW-4N: Standard valve without pressure relief function

LHW-4P: pressure relief function for maximum flow of the valve

LHW-4T pressure relief valve to tank port for pressure

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, design 4P and 4T

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 limiting 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-4N; LHW-4P. LHW-4T

Load Holding Valve Winch

1 ¼”

Subject to Modifications Version: LHW-4N; LHW-4P_ LHW-4T_00E.doc 6/9

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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 4N, 4P and 4T have not provided any signal output for a mechanical brake.

LHW-4N; LHW-4P. LHW-4T

Load Holding Valve Winch

1 ¼”

Subject to Modifications Version: LHW-4N; LHW-4P_ LHW-4T_00E.doc 7/9

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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 (only 4P, 4T)

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

(DIN ISO 6162-2, SAE J518/2 (CO-DE62))

1 ¼“ M14 93,5 180

LHW-4N; LHW-4P. LHW-4T

Load Holding Valve Winch

1 ¼”

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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 per-

mitted, 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 1 ¼”

LHW-4N; LHW-4P. LHW-4T

Load Holding Valve Winch

1 ¼”

Subject to Modifications Version: LHW-4N; LHW-4P_ LHW-4T_00E.doc 9/9

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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!