In this blog post we will be covering 3 common types of control valve: Double Block and Bleed, Manifolds and Ball Valves.
1. Double Block And Bleed Valves
Double Block & Bleed Valves provide primary isolation when directly mounted onto process pipework.
Key features:
· Floating ball valve assembly
· Heavy duty needle valve assembly
· Forged one-piece body for superior grain flow
How A Double Block And Bleed Valve Works
Video credit: JFlow Controls via Youtube
The single units of these valves are often used for applications where complete certainty of shut-off is needed. Sometimes, areas where space is limited, a valve will need to be not only effective, but compact in size, which is another positive of singular unit.
API flanges are available up to an impressive 10,000lbs for inlet unit valves.
Standards: Gas Pressure Testing to BS 6755 Pt 1, Fire Safe BS 6755 Pt 2, ANSI / ASME B16.34, ANSI / ASME B16.5, Material certification EN 10204 3.1b can be provided on request for all materials including stainless steel, Hastelloy C-276 and Monel 400.
2. Manifold Valves
Manifold valves are a type of control valve that is able to isolate and control the flow of media within a system. 2 way, 3 way and 5 way manifold valves are extremely adaptable instrumentation valves. They are designed to replace multiple unit assemblies for reducing leak points, as well as space-saving thanks to their compact form.
Hydraulic manifold valves are used in applications to regulate the flow of media between pumps and actuators.
For those who may be interested in the growth and trends aspect, below is an interesting article by DK-LOK HQ regarding the market of ball valves and manifolds.
3. Ball Valves
Ball valves are a type of control valve that are excellent for shutoff applications.
Key features
· 1000, 3000 and 6000 psi rated ball valve ranges as standard
· Up to 10,000 psi rated on request
· Colour coded handles and cast coded bodies for easy replacement and installation
· Compact and reliable
· Long service life (est) 15 years+ for well-maintained stainless steel
Pressure VS. Temperature
Air flow and water flow pressure drop charts can be seen in our precision valves catalogue for your reference. Tested for pressure drop vs. flow (GPM) and pressure vs. temperature performance include sizes ¼”, 3/8”, ½” and 1” ball valves.
The temperature rating as standard for our ball valves is -45 – 230C of up to six thousand psi safe working pressure.
3D Animation of how a Ball Valve functions
Video credit: Gravity Powered Productions via Youtube
The Issue Of Corrosion Resistance
Corrosion resistant valves are manufactured from materials (alloys) with special properties. The properties of high performance alloys such as Hastelloy, Titanium and Inconel 625 are perfect for coping in corrosive environments. The effectiveness of the valves resistance relies primarily on the perfect choice of alloy. We offer free advice from our engineering team for choosing the correct material of manufacture for the application you may need.
Helpful links:
· Double Block & Bleed Valves Q&A with Paul Shillito at Oliver ValvesThis Q&A piece covers common questions regarding DB&B.
· The True Meaning Of Double Block And Bleed by Valve Magazine
· Valves – ExplainThatStuff.com Tells you what, why and how –a very informative piece for beginners.
· What is a needle valve? By wiseGEEK Everything you need to know about needle valves.
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