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Rubber lined butterfly valve

Rubber lined butterfly valve introduction

Rubber lined butterfly valve is a type of valve which can be used for isolating or regulating flow.  The closing mechanism is the disc, which sits in the center of the valve body. The disc is connected to a handle or actuator via the shaft, which passes from the disc through the top of the valve body. Unlike a ball valve, the disc of the butterfly valve is always present in the flow, which will induce a pressure drop. Rubber lined butterfly valve can be shut off quickly but require less support than a heavier ball valve, due to their lighter weight. 
 

Rubber lined butterfly valve operates in a quarter turn style, meaning that rotating the closed disc 90° will fully open the valve, and vice versa. They can also be opened incrementally in order to throttle flow. This can be accomplished manually, but throttling flow is more precise when used in conjunction with an actuator. Actuators can be customized to allow incremental flow, by using positioner in the case of pneumatic and hydraulic actuators, or by using modulating boards in the case of electric actuators. 
 

Rubber lined butterfly valve offers a light weight, lower cost, heavy duty, and maintenance free solution to high pressure applications. Common applications of rubber lined butterfly valve include: utilities, pulp and paper, oil and gas production, fuel handling systems, marine, petrochemical processing, air conditioning, and refrigeration. Our rubber lined butterfly valve also come in many sizes and styles, including lug-style body and wafer-style body.  
 

Rubber lined butterfly valve is designed as double flanged, lug-style or wafer-style. Resilient seated butterfly valves also offer many types of seat materials to accommodate many process applications, such as Buna-N, EPDM, Viton, and Teflon, as well as FDA approved materials.  Rubber lined butterfly valves have lower pressure ratings than the concentric, high performance, and triple-offset butterfly valves which offer incrementally higher pressure ratings, which are required for an ANSI rating. Any process media flowing through the control loop can be regulated with the proper valve, and our butterfly valve is an excellent valve that provides the precision control and bubble tight seal that an operator requires.


Rubber lined butterfly valve technical parameter

● Connection Type: Wafer, Lug, Double Flange
● Material: Cast Iron, Ductile iron, Carbon steel. Stainless Steel and others
● Actuator Type: Manual, Electric (on-off or regulating), Pneumatic (spring return or double acting)
● Operating Pressure: 10-16 bar,150LB
● Size Range: 2″ to 48″
● Suitable Medium: Water, Air, Gas, etc
.
 

Rubber lined butterfly valve classification

Based on the connection there are different types of rubber lined butterfly valves.
Wafer Type Rubber Lined Butterfly Valve: 
The wafer type rubber lined butterfly valve was built to keep a tight sealing, protecting against bi-directional pressure differentials, to prevent any backflow in devices that were built for uni-directional flow. This is done by the use of a tightly fitted cap, such as an O-ring, gasket, precisely machined, along with a smooth valve face on the downstream and upstream parts of the valve.


Lug Type Rubber Lined Butterfly Valve: 
Lug body type of the butterfly valve can be achieved with threaded inserts, flanges, and two sets of lugs (bolts) that do not use nuts so each flange has its bolts. It is also important to remember that you do not need to shut down the whole device to inspect, clean, repair, or replace the lug butterfly valve.

Double Flanged Rubber Lined Butterfly Valve: 
Double flanged rubber lined butterfly valve has a flange at both ends of the valve to be attached with pipe flanges. This type of end connection is used for the very large size of the butterfly valve.
 

Rubber lined butterfly valve work principle

Rubber lined butterfly valve has a relatively simpler design. The body, seal, disc, and stem are the main parts of the rubber lined butterfly valve. The traditional butterfly valve has a disk located in the middle of the attached pipe and a stem is connected to the actuator or handle on the outside of the valve. When the valve is in a closed position, the disk is perpendicular to the flow and the seat of the valve is shut. The stem is sealed with an O-ring. When the valve makes a turn of 90 degree with the help of actuator or handle, the disk travels away from the valve seat and is located parallel to the flow. The rotation at an angle less than 90-degrees allows the flow to be either throttled or proportional.

  • Wafer full rubber lined butterfly valve

    Wafer full rubber lined butterfly valve

    • Port size:2″ to 48″,DN50-DN1200
    • Pressure:PN10-16 bar,150LB,JIS 5K 10K
    • Structure:Full rubber lined
    • Medium:Water,seawater, air,etc.
    • Temperature :-29~120℃
    • Body material:Cast iron,ductile iron,carbon steel,stainless steel,etc.
  • Flanged fully rubber lined butterfly valve

    Flanged fully rubber lined butterfly valve

    • Port size:2″ to 48″,DN50-DN1200
    • Pressure:PN10-16 bar,150LB,JIS 5K 10K
    • Structure:Full rubber lined
    • Medium:Water,seawater, air,etc.
    • Temperature :-29~120℃
    • Body material:Cast iron,ductile iron,carbon steel,stainless steel,etc.
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