SIMPLE GUIDELINES - MULTIPLE ADVANTAGES
Whenever shut-off or control applications involve abrasive or corrosive slurries, powders, or granular substances, the Larox Valve is the optimum solution. The modern pinch valve technology offers substantial savings through superior performance, longer service life time and low maintenance costs.
The Larox Valve consists of three main components: sleeve, valve body, and actuator. The versatile construction of the Larox Valve enables a customer to choose any actuator, valve body construction or sleeve material according to their process conditions. The variety of combinations is almost unlimited.
The standard range of Larox Valve solutions is for diameters 25 mm - 1000 mm,
temperatures -50 C - +110 C, and pressures 0 - 100 bar. In co-operation with the customers
Larox can engineer a solution to solve problems in applications outside the standard Larox
On this page You will find information about following subjects:
Advantages of Larox valves
Larox valve sleeve - the best sleeve available
The valve sleeve is the only part in contact with the product flow. The selection of the sleeve material is very essential to guarantee the best wear resistance and longest lifetime for the valve sleeve and a trouble-free function of the process. The properties of the modern elastomer sleeves have many advantages compared to the conventional metal parts: rubber is elastic, waterproof, airtight and has considerably better wear resistance than steel. Additionally, the elastomer sleeve provides a low cost solution against many chemicals when compared to more expensive steel materials.
The pinch valve sleeves have a thick wear resistant inner lining, several textile reinforcing cord layers and a wear resistant outer surface. The process conditions such as pressure class, application, medium, and temperature determine the final selection of the valve sleeve material.
The Larox valve sleeve materials range from wear resisting natural rubber to various elastomers and rubber compounds developed to combat the arduous conditions in chemical processing.
The Larox valve sleeve can be supplied with positive opening tags. The opening tags guarantee undisturbed opening of the valve in high temperatures, low pressures and vacuum conditions as well as in situations where the valve has been closed for a longer period of time.
Continuous development and testing results in high quality products
Larox Flowsys Oy and its sleeve manufacturing partner, Teknikum Oy, are continuously testing and developing the valve sleeves in order to find new materials and elastomer compounds to enlarge the operational range of Larox valves to even more aggressive and difficult applications. The Larox brand sleeves are manufactured in accordance with ISO 9001 quality specifications. The whole manufacturing chain of the Larox valve sleeve is controlled by Teknikum Oy. The product control covers all stages starting from the purchase of natural rubber through mixing the compounds to the final sleeve construction and vulcanizing.
The reliability of the Larox valve sleeve is taken into account already when designing the sleeves. The safety factor for the valve sleeve is adjusted to 3 which means that the bursting pressure of the sleeve is 3 times the operating pressure. Because of this factor, the testing of the valve sleeves is restricted to normal random sample inspection. However, Larox Flowsys has complete testing facilities to fulfill any customer requests related to the valve testing procedures.
VALVE BODY TYPES
The open body construction is designed for applications with relatively low pressures
and low temperatures when the flowing medium is non-hazardous. The open body construction
is light and it is very easy to access for service.
The available valve diameters begin with 80 mm. The standard body material is mild
steel, but AISI316 bodies can also be delivered upon request.
The open body offers the advantage of being able to tolerate misalignment and
PVE ENCLOSED BODY
In the enclosed body construction the valve sleeve is covered by the body housing which protects the sleeve from the environment and sun shine. The enclosed body keeps the flowing medium inside even though the sleeve has been ruptured.
The enclosed body construction can also be used in applications where fugitive emission
protection is specified. This enclosed PVE/S valve is equipped with a fugitive emission
package that includes the stem and body seals to provide a secondary containment of the
fluid in the valve and leakage to the outside environment from the valve body.
The valve body is equipped with a tap in the lower half of the valve body with a
threaded AISI 316 plug. Additionally available is a gauge indicating the pressure changes
in the valve body. The standard body materials are cast iron/mild steel, aluminum and
PVS SEALED BODY
The sealed body construction is designed for applications where no leakage of the
flowing medium through the valve body is allowed to the environment. The PVS model has
proved especially successful in high pressure applications due to the extremely resistant
body construction. The sealed body can be equipped with an alarm or piping to ensure that
the sleeve rupture can be noticed immediately.
All the valve bodies are flange ended. The standard flange drillings are according to the DIN, ANSI, and BS/AS standards. Any special customer requirements can be accomplished upon request.
The Larox valves close on center line to maximize the sleeve life time and provide
better control in modulating or throttling applications.
ACTUATORS FOR EVERY NEED
MANUAL ACTUATORS (M)
The manual valves are equipped with a handwheel actuator. The screw mechanism of the manually operated valves is totally enclosed, and thus protected against dirt and corrosion to ensure reliable operation.
The large diameter manual valves and the valves used in high pressure applications come equipped with a reduction gear to ease the operation. Manual valves can also be fitted with a chain wheel and extended stem.
WIDE VARIETY OF PNEUMATIC ACTUATORS (A)
The pneumatic actuator is a double acting cylinder. The standard supply pressure for the pneumatic cylinder is min. 6 bar. The cylinder size is determined according to the process line pressure.
The pneumatic actuator is also available in special materials for aggressive conditions.
Control valve actuators
HYDRAULIC ACTUATORS (H)
The hydraulic actuator is a double acting cylinder. The standard supply pressure for the hydraulic cylinder is min. 150 bars. The final cylinder size is determined according to the line pressure.
The standard cylinder is equipped with a pilot operated check valve which keeps the valve in position when hydraulic pressure is not available.
The Larox valve product range includes also hydraulic power packs to actuate the hydraulic valves. Tailor made solutions are available upon customer requests.
ELECTROMECHANICAL ACTUATORS (E)
The standard electromechanical actuator types are AUMA Norm SA-series and Rotork IQ-series actuators equipped with build-in limit switches and manual handwheel. The standard voltage is 380V 50Hz, others on request.
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