Monthly Archives: January 2018

  • Block Valve: What It Is & How It's Used



    If you've ever read our blog, you may know a thing or two about valves. We've posted an overview of butterfly valves, guides to cleaning and fixing ball valves, and even a semi-comprehensive list of the most common types of valves. Until now, however, we have not mentioned block valves. But the term "block valve" describes many of the valves we've talked about.

    The strictest definition of "block valve" (or shutoff valve) refers to it as "any valve that has the capacity to block movement in one or more directions." Usually, however, people use the term when referencing a valve that can totally prevent or allow motion. This means that a block valve should A) be able to completely stop flow when closed and B) allow fluid motion to happen unrestricted when open. Flow is either completely allowed or completely denied when a block valve is in action.

    In this post we will cover the most common types of valves that fall under the "block valve" umbrella. This could help you when choosing block valves for your next project!

    Types of Block Valves

    An important detail about block valves is that their name is not an official classification of a specific type of valve. Rather, it is a broad description of several types of valves that are designed to block flow.

    Several valves immediately disqualify themselves from being block valves due to their design. Globe valves are a type of control valve that, because of their design, limit flow regardless of how far open they are. The same is true of butterfly valves, which have discs right in the middle of the pipeline. The following are a few types of valves that have block valve characteristics.

    Ball Valves

    PVC ball valve with red handleBall valves are probably the most common type of valve there is, especially in the PVC applications we tend to see.These valves are usually used to totally turn on/off flow in a system using a spherical seating with a hole in it. This hole allows liquid to flow through when the valve is in the "on" position.

    Some ball valves are available in "full-bore" configurations, which means the hole in the ball is the same diameter as the pipeline. Full-bore ball valves are perfect examples of block valves, as they are not ideal for slowing down or limiting flow, but excel at completely stopping it and letting it pass uninterrupted. Ball check valves are not block valves, as they typically limit flow even when being pushed open by liquid.

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  • What are the Different Types of Butterfly Valves? - Valve Buying Guide



     

    lug butterfly valves and wafer butterfly valvesButterfly valves, as you may already know, are a type of quarter-turn valve with disc-shaped seatings. The disc sits perpendicular to flow of when the valve is closed and parallel to flow when the valve is open. These valves are handle-operated, gear-operated, or mechanically/pneumatically actuated. While the operation of butterfly valves is straightforward, most people do not know about the different types of butterfly valves that exist.

    With butterfly valve options such as different body types, materials, and operation methods, many types of butterfly valves are available. First, let's examine the different body types, then move on to materials and operation methods. These factors tell you what the valve is capable of. Choosing butterfly valves for your application can be difficult, so we will attempt to make it easier with this blog post!

    Butterfly Valve Body Types

    Butterfly valves are popular because of their low-profile designs. They are thin, usually taking up much less space in a pipeline than ball valves. The difference in the two main variations of butterfly valves is how they attach to the pipeline. These body styles are lug and wafer style. What's the difference between lug and wafer style butterfly valves? Keep reading to find out.

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