411homerepair.com

Latest Articles

Roofing Styles and Designs: So Many Options

If you’re building a new home and are just in the early planning stages, you may want to give some extra thought to the type of roof you want...

on Apr 25, 2017

The 4 Biggest Hidden Home Renovation Costs

Undertaking a full home renovation is a huge project – and even just restoring a few rooms in your home can cost you quite a bit of time and...

on Apr 24, 2017

10 Tips To Lowering An Electricity Bill

10 Tips To Lowering An Electricity Bill This lay out 10 different strategies you can do to help drastically lower your electricity bill so that...

on Apr 23, 2017

Reasons to Hire End of Lease Cleaning Services

You love your apartment, and you have made many great memories there. However, now you must consider what to do as you near the end of your lease....

on Apr 21, 2017

Are Blocked Drains a Landlord's Responsibility?

As a tenant renting a property, you are expected to do any kind of reasonable maintenance work that prevents damage to the property. But what...

on Apr 20, 2017

Types of Butterfly Valves

by Guest on Nov 16, 2011

Butterfly valves got their name from their appearance of a single rod surrounded by two semi-circular discs loosely resembling the body of a butterfly. Older cars that used carburetor instead of an electronic fuel injection system were probably the most commonly known types. Often confused with the choke, the purpose of the butterfly valve in the carburetor was to cut off air to the cylinders when the car was cold so that the car could be started with a rich mixture of gasoline and air. As the car would warm up, a temperature sensor would cause the valve to open up more to let more air into the engine. Actually, this is a great example of an actuated butterfly valve where an actuator outside the valve changes the position of the valve based upon an outside condition, in this case the engine temperature.

The greatest advantage to these valves is that they are inexpensive compared to other types of valves. They are good for low pressure types of applications where a perfect seal is not really required like on municipal waste water lines. Due to the fact that the rod and discs are actually in the fluid flow, a drop in pressure is always present as the fluid passed through the valve. Since these valves are so simple, they are also the easiest to maintain of all valve types. But there are downsides too. Since they do not seal well, this type of valve is not really good for corrosive materials. Also, since they cause a pressure drop, they may require some kind of bypass valve to pressure balance the system before the valve can be opened in a large installation.

Ball valves in comparison are larger in size and use a sphere or ball inside the valve with a hole in it that can completely seal when closed and let the fluid pass through the valve with no pressure drop as long as the valve hole is at least as large as the input pipe diameter. Used for high-pressure applications involving corrosive substances and gases, the ball type of valve is more expensive but has the added advantage of never failing to open due to high supply pressure. It is often used for pipes less than six inches in diameter that carry high pressure gases or liquids which require a reliable cutoff seal.

The spring return butterfly valve is a more complex type that is more energy efficient but also more problematic. The springs are used to open and close the valve. Since the springs store energy, this makes them more energy efficient to operate. Special films that reduce friction can also be applied that will increase the energy efficiency even further in some applications. There are wide variety of spring return valves which allow a lot of customization in application and design. However, a spring loaded valve can have problems where high-speed valve operation may be required such as inside a car engine. When a spring goes bad at high speeds it can cause engines to open and close valves at the wrong times or hang open causing a backfire causing potential severe damage to the engine. For this reason, it is very important that springs used are carefully matched to original specification when replaced.

From simple manually operated 90-degree turn type valves to electronically actuated automatic spring return type valves, there are many different styles of butterfly valves. Their main advantages are that they are cheap, simple and reliable. But they do not make good choices for applications requiring high-pressure, corrosive fluids or a tight seal.

Random Articles

French Door Refrigerators -- Where Style Meets Function

If you are in the market for a refrigerator that will add style to function, you may want to consider shopping for French door refrigerators....

Appliance / Repair

3 Things to Look for in a Plumbing Repair Company

Keeping up with all of the systems in your home can be a very arduous task, but one that is well worth the effort. There are a number of factors...

Hire Contractors / Estimates

Wall Cladding For The Home of Your Dreams

Everyone wishes to own a house of their dreams; a home that is designed as per their tastes and choices. When one goes house hunting, they conjure...

Walls / Ceilings / Attics

The Different Types of Anti Slip and Non Slip Tape

Slipping over on floors or down stairs are common forms of accidents in the workplace and in the home. Slips and falls can result in serious...

Floors / Tile / Hardwood

How To Make a Choice in Shapes of Showering Screens?

You don’t have to be careful, not to spill water out of the showering space anymore. This is indeed a boon to have a careless and comforting bath...

Kitchen / Bathrooms

Actions

Contact Us | Submit Article | RSS | 411homerepair © 2017