‘Wafer’ butterfly valves whose bodies are sandwiched between pipe flanges do not achieve this. Since replacement of air valves is likely to be cheaper than in situ refurbishment, flanged isolating valves are preferred in such situations. Capable of handling large flows — Because butterfly valves are capable of handling large fluid flows, they are especially popular for irrigation and water industry applications in Australia. Large Butterfly valves are usually equipped with a gearbox-type actuator, where the handwheel is connected to the stem via a gearbox. This will reduce the force but at the same time reduce the speed of the operation. If the valve is closed during installation, the rubber seat will wedge against the valve disc and make it difficult to open.

Butterfly valves

As such, duplex stainless steel valves are used for larger pipelines where higher strength and rigidity is needed in combination to the toughness offered by austenite. Butterfly valve manufacturers usually labels valves according to their maximum pressure and temperature. High pressure valves are also available for piping applications requiring high pressure. Butterfly valves belong to the family of valves known as quarter-turn valves. By turning the disc, the valve is closed so that all passageways are blocked. The disc of the valve is rotated a quarter turn when it is fully open so that the fluid can pass almost unrestricted through it.

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A lug-style butterfly is suitable for end-of-line service but wafer-style butterfly valves can not be used for end-of-line services. In case there is a maintenance requirement on the line having water style butterfly valve, the entire line needs to be shut down. The concentric butterfly valve is the most basic type of butterfly valve design. In this design, the valve stem passes through the centreline of the disc. Concentric butterfly valves are used for low-pressure services.

What is a butterfly valve and where it is used in water supply?

As it is a regulating valve, it controls the flow rate of system through the help of actuators. Basically, when a flow monitor senses that a set parameter has been reached, it will signal the valve actuator to close or open the valve. How to size and select high-performance butterfly valves according to physical criteria, pressure rating, and international standards. Butterfly valves are designed for a variety of general applications for controlling liquids, gases, and slurries. We offer wafer and lug butterfly valves in a range of sizes, performance ratings, and actuation options.

butterfly valve specification standard

Except for pressure-relief applications, the quick-opening characteristic is seldom employed for control applications. Pressure activation of the seat enhances sealing with increasing line pressure, even though the disc is moving away from the seat due to the same pressure. UHMW Polyethylene – Used for higher radioactive applications where PTFE is not acceptable. This material also meets the requirements of the tobacco industry where PTFE is not acceptable and is especially well suited for handling highly abrasive media.

Double Offset API 609 Type B

In food industries where there are aggressive washdown processes, butterfly valves can be used for backflow prevention. This is necessary, from standard regulations, as it is aimed in food processing to deliver procedures in sanitary conditions. The operation can be through a packing from a pneumatic actuator, an electric motor, a solenoid or a hydraulic piston and cylinder. Either way, this type of valve is the most economical and the easiest to handle. Butterfly Valves are also more affordable than other types of valves. Another component, the resilient seat is fixed on the body to give a proper seal.

An Overview of Butterfly Valves

Butterfly Valve Throttling service limited to low differential pressure. The Butterfly Valve is a quarter-turn valve that goes from fully open to fully closed… A Butterfly valve is a quarter-turn rotational motion valve, that is used to stop, regulate, and start flow.

What Many people are Saying About Types Of Butterfly Valve Is Dead Wrong And Why

The specific sealing pressure is generated by the pressure of the elastic sealing element on the valve seat or valve plate. Butterfly valves can be divided into concentric or eccentric types depending on the location of the stem related to the disc and the angle of the seat surface on which the disc closes. Butterfly valves can be connected with the piping system in different forms. The most popular styles are the wafer type connection and lug type connection. Butterfly valves are available in several designs with multiple applications and pressure limits.

Butterfly Valves

In low-pressure applications, concentratic valves are commonly used. A rod runs through the disc to an actuator on the valve’s outside. Rotating the actuator causes the disc to move in either a parallel or perpendicular direction to the flow.

Concentric Butterfly Valve

This will test if it has the right clearance form the inside of the pipes. Commercial Filtration Supply is a leading Authorized Filtration Distributor for Eaton, Titan, NeoLogic, Spears and other top brands. CFS proudly offers deep discount pricing and easy ordering for all your filtration needs.

Butterfly Valve vs Ball Valve

When the butterfly valve is fully opened, the disc is at a right angle to the flow of gas or liquid. For highly critical applications, a triple offset butterfly valve is used. This design results in minimal seat contact thus very less wear and highly efficient. Ball valves have a wide range of connection types with flanges or threads, while butterfly valves are limited to flange style with a wafer or lug design. Butterfly valves are cheaper than ball valves, especially for larger diameter sizes. Most gate valves are used for forced sealing, that is, when the valve is close, to rely on external force to force the gate to the seat, in order to ensure the sealing surface of the seal.

The Advantages Of Butterfly Valve Vs Gate Valve

Optimal valve choice will take temperature, pressure, the substances you wish to pipe, pricing, maintenance, actuation methods, and forces required into consideration. Shutoff or on-off valves offer a tight seal to help route flows or isolate parts of your piping processes for monitoring or maintenance. The center of the plug features a flow channel of varying size and shape that ultimately determines the pressure drop and throughput characteristics of the valve. If you’re looking for more information on considerations surrounding throttling valves, be sure to check out our comparison between needle valves and ball valves.

CAD Drawings of Butterfly Valves

These valves are used for gases, liquids, slurries, powders, and vacuum. Butterfly valves belong to the quarter-turn rotational motion valves family and are used primarily to stop, regulate, or start the flow. The term “butterfly” in a butterfly valve vs ball valve valve is actually a disk that is connected to a rod. When this rod rotates the disk by 90° the butterfly valve opens or closes. Butterfly valves are popular in the industry because of their lightweight, fast operation, and low costs. These valves use handles, gears, or automatic actuators for operation as per the requirement.

Lug Style Butterfly Valve

They are especially suitable for two-way sealing and In occasions where the valve body is prone to rust, it is used as a flow adjustment and interception medium. The disk is essentially an off-center slice of a ball, and the seating mechanism of this valve is similar to that of a ball valve. The disk and seats of this valve are offset from the shaft and shaft sealing in this valve is not critical. Diaphragm valves,gate valves, butterfly valves, ball valves, globe valves, check valves, knife valves etc. A wafer-type butterfly valve is sandwiched between two pipe flanges and the flange bolts surround the valve body. A wafer butterfly valve provides sealing against bi-directional pressure difference in the fluid flow.

butterfly valve vs gate valve

In order to do this, vortex formation should be eliminated or reduced. One of the causes of vortex formation is when flow is obstructed by the valve. It may happen in butterfly valves due to the interruption of water flow from its disc. Butterfly valves were once used in low-pressure applications that do not require tight shut-off. They were preferred because of their lightweight and space-saving characteristics where systems can also benefit from their low-pressure drops.

Working Principles of Butterfly Valves

Lugged valves are extremely resistant to chemicals and solvents and can handle temperatures up to 200 °C, which makes it a versatile solution. Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they cost less than other valve designs, and are lighter weight so they need less support. A rod passes through the disc to an actuator on the outside of the valve.

Fluids and Tools

There are many variations in disc design, orientation, and material in order to improve flow, sealing, and/or operating torque. For example, Hawle’s 9881k double eccentric disc is designed to reduce seal wear and “scuffing” as well as operating torque requirements. In double offset butterfly valves, the stem axis is offset behind the centerline of the seat and the body , then the stem axis is further offset from the vertical centerline of the valve .

Butterfly valves according to ASME standard by Häger Industriearmaturen

Butterfly valves are used in many applications that’s why organizations have made a number of international standards for the manufacture of these valves. Butterfly valve standards ensure that there would be uniformity in designs and compatibility with other components such as the flange. Titanium alloys have the highest strength-to-weight ratio compared to any other metal.