Views: 0 Author: Site Editor Publish Time: 2022-05-03 Origin: Site
A WRAS butterfly valve is a rotary valve that uses a disc as the closure member. WRAS butterfly valve are the most specified valve type for moderate-duty conditions in pipe sizes of two inches and larger. WRAS butterfly valve’s reduced weight, reliable bubble-tight shut-off, ease of operation and automation allowed them to displace gate valves in traditional applications.
What are the components of WRAS butterfly valve?
How can WRAS butterfly valve do?
What are the requirements when WRAS butterfly valve is used for modulating service?
WRAS butterfly valve’s body: WRAS butterfly valves generally have bodies that fit between two pipe flanges. The most common body designs are lug and wafer.
WRAS butterfly valve’s rotating disk: The flow closure member of a WRAS butterfly valve is the disk. A WRAS butterfly valve is a flow control device that incorporates a rotational disk to control the flowing media in a process. The disk is always in the passageway, but because it is relatively thin, it offers little resistance to flow.
WRAS butterfly valve’s stem: The stem of the WRAS butterfly valve may be a one-piece shaft or a two-piece design.
WRAS butterfly valve’s seat: Since the disc in a WRAS butterfly valve is fully supported by the shaft and its bearings, the seat is required only to perform a sealing function, not a strong supporting function, as is common with most ball valve designs.
The WRAS butterfly valve operates based on the quick shut off principle. The circular disc (butterfly) of the WRAS butterfly valve is placed in the center of the pipe which allows a rod to go through it to an actuator, on the outer side of the WRAS butterfly valve. Using the handwheel, the metal disc is rotated to keep the disc parallel or perpendicular to the flow and it allows or closes the flow. So, the operating principle of the WRAS butterfly valves is fairly simple.
The WRAS butterfly valve is one of the few industrial valves that are both efficient in isolating and regulating the flow of media. The WRAS butterfly valve is also quick to open. The disc is attached to the stem, either through the former or the stem is at the back of the disc. The stem is attached to the handle that is either placed on top of the body or at its side.
WRAS butterfly valve is a butterfly valve that has certification which refers to the Water Regulation Advisory Scheme. WRAS is a certification for drinking water safety in the UK. The Water Regulation Advisory Scheme (WRAS) is a certification scheme for the British water industry. The products approved by this scheme show that it meets the requirements of the 1999 Water Supply System (Water Fittings) Regulations and its revised edition.
WRAS certification includes material certification and product certification.
The test scope of material certification includes: plumbing pipes, faucets, valve parts, rubber products, plastics and other materials that are in contact with water. The materials that may be used to manufacture related equipment must meet the standards of British BS6920 or BS5750 PART.
The smell and taste of the water in contact with the butterfly valve will not change.
The appearance of the material in contact with water will not change.
Do not cause the growth of aquatic microorganisms.
No precipitation of toxic metals.
Dol not contain or release substances that affect public health.
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