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