Wafer Lug Butterfly Valve

American Standard 815L/830L series

Engineering through (DN)

The American Standard butterfly valve plate is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis,

American Standard Butterfly Valve

The rotation angle is between 0° and 90°, and when the rotation reaches 90°, the valve is in a fully open state.

American standard butterfly valve has simple structure, small size and light weight, and only consists of a few parts. And it only needs to rotate 90° to open and close quickly, the operation is simple, and the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has better flow control characteristics. Butterfly valves have two types of seals: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be inlaid on the valve body or attached to the periphery of the disc.

Valves with metal seals generally have a longer life than those with elastic seals, but it is difficult to achieve complete sealing. Metal seals can adapt to higher operating temperatures, while elastomeric seals have the disadvantage of being limited by temperature.

If the butterfly valve is required to be used as flow control, the main thing is to correctly select the size and type of the valve. The structure principle of the butterfly valve is especially suitable for making large-diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, water treatment, etc., but also in the cooling water system of thermal power plants. This type of valve should generally be installed horizontally in the pipeline.Performance Comparison of American Standard Butterfly Valves

Which of the ordinary butterfly valve and gate valve with the same nominal pressure and nominal diameter has better tightness and is not easy to leak?

The tightness of the gate valve is better than that of the butterfly valve, but there are also manufacturers of butterfly valves with good tightness.

The gate valve is bulky and takes up a lot of space.

The butterfly valve is small in size and takes up little space.

The temperature of the medium, the sealing and packing of the valve should also be considered when selecting it.

The specification stipulates the use of butterfly valves with a nominal diameter greater than 50.

American Standard Butterfly Valve is a national key new product. The high-performance manual butterfly valve adopts a double eccentric and a special inclined cone elliptical sealing structure. It solves the disadvantage that the sealing surface of the traditional eccentric butterfly valve is still in sliding contact friction at the moment of opening and closing 0°~10°, and realizes the effect that the sealing surface of the butterfly plate is separated at the moment of opening, and the sealing is closed when the contact is closed, so as to prolong the service life and achieve the best sealing performance. good purpose.

use

It is used for gas pipelines in the sulfuric acid industry: the inlet and outlet of the blower in front of the furnace, the inlet and outlet of the relay fan, the series and connection valves of electric demister, the inlet and outlet of the S02 main blower, the adjustment of the converter, the inlet and outlet of the preheater, etc. and the use of cut-off gas.

It is used for sulfur incineration, conversion and dry suction in the sulfuric acid system. It is the preferred brand of valves for sulfuric acid plants. It is considered by the majority of users as: good sealing performance, light operation, secondary corrosion, high temperature resistance, convenient operation, Flexible, safe and reliable butterfly valves have been widely used.

It is also widely used in: SO2, steam, air, gas, ammonia, CO2 gas, oil, water, brine, lye, seawater, nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid in chemical, petrochemical, smelting, pharmaceutical, food and other industries It is used as a regulating and shut-off device on pipelines such as medium.Structural features

①The unique design of three-way eccentricity enables frictionless transmission between the sealing surfaces and prolongs the service life of the valve.

②Elastic seal is produced by torque.

③The ingenious wedge-shaped design enables the valve to have the automatic sealing function of closing and tightening, and the sealing surfaces have compensation and zero leakage.

④Small size, light weight, light operation and easy installation.

⑤Pneumatic and electric devices can be configured according to user requirements to meet the needs of remote control and program control.

⑥The material of replacement parts can be applied to various media, and can be lined with anti-corrosion (lining with F46, GXPP, PO, etc.).

⑦Continuous structure diversification: wafer, flange, butt welding.

Main technical parameters of American standard butterfly valve

Nominal diameter Dn (in) 2″-36″ 2″-36″

Nominal pressure PN (MPa) 150Lb 300Lb

Test pressure Ps (MPa) Strength test 3.0 7.5

Seal test 2.2 5.5

Applicable medium water, steam, postal products, acid and alkali, sea water, etc.

Applicable temperature -40～425℃

 American Standard Butterfly Valve Main Parts Material

 name material

Body WCB, CF8, CF8M

Valve plate WCB, CF8, CF8M

Shaft 304, 316, 1Cr13

Seal 316, 304

Filler Flexible graphite, fluoroplastic