Larox Pinch Valves

THE SOLUTION YOU´VE BEEN LOOKING FOR

Larox Valves

Ideal for shut off applications involving

Abrasive Corrosive slurries Powders and Coarse substances

Our solutions offer substantial savings

Improved performance Longer service lifetime Lower maintenance costs

Modular Design

Three main components

The sleeve The body with mechanical

closing bars The actuator

The sleeve is the only part in contact with the process medium

Can be tailored to suit most process conditions

In the open position, the valve is at full bore with no flow restrictions

Operating Principle

During closing, two pinch bars squeeze the sleeve shut on the centerline

Technical Features

Full bore Only the sleeve is in

contact with the medium

Centerline closing Flexible sleeve

Process Benefits

100 % tight Excellent wear resistance High corrosion resistance No jamming or clogging Self-cleaning Trouble-free operation Long service intervals Low maintenance costs Reduced cost of ownership

Larox Manual Valves

The standard range

Diameters of 25 mm to

1 000 mm Temperatures from -50°C

to +160 °C Operating pressures from

vacuum to 100 bar Equipped with hand wheel Totally enclosed for full

protection A reduction gear when

needed

Technical Specifications

Open body (PV)

For non-hazardous media, lower pressures and lower operating temperatures

Light-weight and easy to service

Size range starts from 80 mm Body materials

• Fabricated carbon steel• Stainless steel

Technical Specifications

Enclosed design protects the sleeve from the environment

Safe to operate Diameters begin with 25 mm Body materials

• Cast iron/fabricated carbon steel

• Stainless steel• Aluminium• Polyurethane (up to DN150,

6 bar)• Polyamide (DN250, 10 bar)

Enclosed body (PVE)

Special Products

Sealed body (PVS)

Designed to add safety to processes involving hazardous media or high operating pressures

Completely enclosed stem and sidebars

100 % protection against any leakage

Size range starting from 25 mm Body materials

• Cast iron/fabricated carbon steel

• Stainless steel

Enclosed/sealed body (PVE/S)

Designed to add safety Stem and side bars are sealed

with O rings Prevents leakage from the

valve body Size range starts from 25 mm Body materials

• Cast iron/fabricated carbon steel

• Stainless steel• Aluminium

Larox Valve Composition

Encapsuled stem and nut

Bearing

Position indicator

Center bushing

Sleeve

Side bushingPlug

Lower pinch bar

Guide (plate)

Body seal

Upper pinch bar

Sleeve adjustment nuts

Grease nipple

Main Dimensions/Open Body

Main Dimensions/Enclosed Body

Actuated On-Off Valves

Ideal when remote control is required

The actuator type depends on

• The process pressure

• Valve size • The availability of

power sources and• Other process

requirements

Standard Actuators Pneumatic Actuators (A)

Double acting allowing fast opening and closing

Suitable for a wide range of industrial application

Improved corrosion resistance Simple installation Fail-safe options

• Manual override (AB)• Mechanical spring (AV)• Pneumatic spring (AU)

Standard Actuators

Hydraulic Actuators (H)

Ideal for high pressure applications and large valve diameters

A pilot operated check valve for fail-safe function

Standard Actuators

Electric Actuators (E) Incorporates built-in

limit and torque switches and a manual override hand wheel

Best suited for applications requiring high closing forces

Special Actuators

Pneumatic Motor Driven Actuator

Ideal for high force applications with limited space

Hydraulic Actuators with an Integrated Power Unit

Electrically driven stand-alone hydraulic unit

Other Special Actuators

Tailor-made solutions for customers’ projects

OEM deliveries Engineering projects

Larox Control Valves For demanding control

applications

Controllability can be further improved with conical sleeves or smart positioners

Elastic sleeves have been applied for improved wear resistance.

Standard positioners Electro-pneumatic (AK) and

pneumatic (AN) for pneumatic actuators

Electro-hydraulic (HP) for hydraulic actuators

Electronic (EO) for electric actuator

Larox Control Valves

The sizing of control valves

Larox valve sizing program and service is based on IEC60534 standard

Available in metric and imperial unitsΔp

G

FFN

QC

RP1v

Main Dimensions/Open Body

Main Dimensions/Enclosed Body

Valve Model Selection

Example: PVE100AK10 - 203LR

Automatic Valve Auxiliaries

R Z

S Q

Inductive limits (R)e.g. 12...24 V DC, 3-wire, PNP/NPN

or V AC/DC, 2-wire

Magnetic limits (S)e.g. V AC/DC, 2-wire or 10...30 V DC,

3-wire, PNP/NPN

Mechanical limits (T)e.g. 2 pole N/C + N/O snap action

Solenoid valve (Z)

e.g. 5/3-way, 24 V DC or

220 V AC Quick exhaust valve

(Q)

Larox Sleeves

THE SOLUTION YOU´VE BEEN LOOKING FOR

Larox Sleeves

Technical Features

Size range: 25 mm - 1000 mm Temperatures: -50°C - +160 °C Operating pressure from vacuum

to 100 bar

Product Features

Full bore 100 % tight Only the sleeve is in contact with

the medium Flexible Self-cleaning

Process Benefits

Excellent wear resistance High corrosion resistance No turbulence No flow restriction

Larox Sleeve Design

The standard sleeve design includes three sets of layers

• The inner layer is resistant to wear and chemical substances• The reinforcement layers give the sleeve its pressure retaining capability• The outer layer protects the sleeve

Inner layer

Reinforcement layersOuter layer

Larox Sleeves

All standard sleeves are equipped with opening tags to ensure complete valve opening under all conditions

Opening tags

Reinforcing cords

Wear-resistant inner lining

Sleeve Model Selection

Example: SBRT 10100/250/3L2

Standard Sleeves

Other Sleeve Material Options

Special Sleeve Designs

Conical sleeve

Ensures accurate flow control Smaller than the pipeline size Sizes: 25 mm – 400 mm

Vacuum sleeve

Ideal for negative pressure applications

Ideal for sleeve pulsation applications

Sizes: 80 mm – 700 mm

Special Sleeve Designs

SensoMate Sleeve

Detects and signals critical wear Available in all standard

materials and sizes

PU Lined Sleeve

Improved protection

against wear and

corrosion Maximum operating

temperature 80°C Sizes: 25 mm – 300 mm

.

Larox sleeve with polyurethane lining

Other special sleeves

High pressure For food industry With one flange