ASTM A126 CLASS B 15LB watts lug butterfly valve

Product Overview

Description

Feature:

Size:Various

Medium:Water,steam,oil,strong base and so on

Suppplier: Factory Direct

Application: used in large diameter (LV) air,gas pipes road and water routes

 

Advantage:

Professional: We are professional manufacturer of valves.Ensure our valves is quality controlled and reliable.

Quality Control: We have been engaged in valve design for many year and can guarantee best quality

Experienced Sales Team: Our sales team is experienced, and they all know our product well.

About Price: we provide very reasonable and competitive price for you

 

Our Capacity:

1)Date of foundation:2007

2)Total Revenue:Above $100 million

3)About QC: Excellence, quality first is our philosophy

4)Sales Market: Europeaa and other Overseas markets

5)Main Products: Gate Valves, Ball Valves, Check Valves, Butterfly Valves, Globe Valves, and Y Straine.

 

 

Specification: 

Brief of butterfly:

Butterfly valve can be used for isolating or regulating flow. The closing mechanism takes the form of a disk. Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support is required. The disc is positioned in the center of the pipe, passing through the disc is a rod connected to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, therefore a pressure drop is always induced in the flow, regardless of valve position.In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.

There are different kinds of butterfly valves, each adapted for different pressures and different usage. The zero offset butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating. The high performance double offset butterfly valve, used in slightly higher-pressure systems, is offset from the centre line of the disc seat and body seal (offset one), and the centre line of the bore (offset two). This creates a cam action during operation to lift the seat out of the seal resulting in less friction than is created in the zero offset design and decreases its tendency to wear. The valve best suited for high-pressure systems is the triple offset butterfly valve. In this valve the disc seat contact axis is offset, which acts to virtually eliminate sliding contact between disc and seat. In the case of triple offset valves the seat is made of metal so that it can be machined such as to achieve a bubble tight shut-off when in contact with the disc.

Butterfly valve types:

Concentric butterfly valves - This type of valve has a resilient rubber seat with a metal disc.

Doubly-eccentric butterfly valves (high-performance butterfly valves or double-offset butterfly valves) - Different type of materials is used for seat and disc.

Triply-eccentric butterfly valves (triple-offset butterfly valves) - The seats are either laminated or solid metal seat design.

Triple-eccentric (offset) design

Triple eccentric (offset) Design prevents galling and scratches between the metal seat and the metal disc due to its unique design. The only time where the seal comes into contact with the seat is at the point of complete closure. Triple offset valves are generally used in applications which require bi-directional tight shut-off in oil and gas, LNG/NPG terminal and tanks, chemical factories, and shipbuilding. They are also used for dirty/heavy oil to prevent extrusion.

Wafer-style butterfly valves

The wafer style butterfly valve is designed to maintain a seal against bi-directional pressure differential to prevent any backflow in systems designed for unidirectional flow. It accomplishes this with a tightly fitting seal; i.e., gasket, o-ring, precision machined, and a flat valve face on the upstream and downstream sides of the valve.

Lug-style butterfly valve

Lug-style valves have threaded inserts at both sides of the valve body. This allows them to be installed into a system using two sets of bolts and no nuts. The valve is installed between two flanges using a separate set of bolts for each flange. This setup permits either side of the piping system to be disconnected without disturbing the other side.

A lug-style butterfly valve used in dead end service generally has a reduced pressure rating. For example a lug-style butterfly valve mounted between two flanges has a 150 psi pressure rating. The same valve mounted with one flange, in dead end service, has a 75 psi rating.

Use in industry

In the pharmaceutical, chemical and food industry a butterfly valve is used to interrupt product flow (solid, liquid, gas) within the process. The valves used in these industries are usually manufactured according cGMP guidelines (current good manufacturing practise).

 

Butterfly features:

1. Small and light , and easy installation and mintanance. It can be mounted wherever needed.

 

2. Siple and compact construction, quick 90 degree on-off operation.

 

3. Miniminzed operating torque, energy saving.

 

4. Flow curve tending to straight line. Excellent regulation performance.

 

5. Long service life Standing the test of tens of thousands opening/closing operations.

 

6. Bubbles-tight sealing with no leakage under the pressure test.

 

7. Wide selection of materials, applicable forvarious medium.

Main diamension:

Butterfly valve series:

 

If the products are not stated above, please send us an inquiry with product type, material, size, and quantity . We will reply you within 24 hours.

 

Packaging Detail	PVC package or wooden cases, also according to our customer's requirement.Custom made is accepted.
Delivery Detail	30 days after receiving the remittance.

 

Shipping

 

Product Process:

 

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