Articles Archives • CGIS: Valves, Actuators & Accessories for Severe Service

Guide to Check Valves: Types, Functions, and Applications

In industrial piping systems, preventing reverse flow is critical to protecting equipment and maintaining safe operations. That is where check valves—also known as non-return valves play a vital role. These valves allow flow in one direction while automatically preventing backflow. Poor valve selection can lead to catastrophic failures. For industrial operations, these risks can translate […]

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What is a Control Valve? Understanding Functions and Types

Articles, Control Valves

Control valves are critical elements that regulate flow, pressure, temperature, and level within a process. Without the right valve, even the most advanced plant design can suffer from inefficiency, safety risks, or costly downtime. Choosing and applying valves correctly is one of the most important decisions in plant design and operation. In this article, we’ll

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Valve Glossary

Articles, Valve 101

A reference tool to help users understand and clarify the meaning of specific terms and concepts within world of valves.

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Bidirectionality in Isolation Valves

Articles, Home-page, Valve Misconceptions

There are many types of valves used to isolate process flow. Each valve type has its own ability when it is fully closed and in isolation mode. The degree of tightness varies with valve type, make, media, differential pressure, temperature, and time in service. Some valve types or special preparations have unequal isolating abilities depending

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Butterfly Valves 101

Articles, Butterfly Valves

A basic introduction to Butterfly Valves Butterfly Valves get their name from the Butterfly appearance of the disc and stem. The design consists of a round disc that is attached to a shaft rotating 90°. When the disc rotates to be parallel with the flow, the valve is fully open. To close the valve, the

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Butterfly Valves — Triple Offset Design

Articles, Butterfly Valves

The unique triple offset of the valve means the seating is affected with almost zero friction. The disc lifts off the seat without dragging across the surface. Because of this feature, these valves could be placed through 500,000 cycles of operation without any degradation in seating performance. The diagram below illustrates the inclined conical sealing

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What is a Guided Shear Gate Valve and why is it a Severe Service Knife Gate Valve?

Articles, Guided Shear Gate Valves, Knife Gate Valves, Severe Service Valves

All valves perform a duty. Their ability to perform varies by valve type and internal design features and materials. In addition, knowledge and experience play a significant part in any successful installation. Accurate descriptions and consistent communication regarding the specifications of the valve required, and the attributes of the application it needs to perform within,

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Six factors to consider when buying a Severe Service Valve

Articles, Home-page, Severe Service Valves

The term Severe Service Valve (SSV) is commonplace to the industrial valve industry. The problem is no one really knows exactly what it means. CGIS is in the process of establishing the exact definition. Once in place and approved by the Manufacturers Standardization Society of the Valve and Fittings Industry (MSS for short), there will

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Allowable Leakage vs. Zero Leakage vs. Bubble Tight

Articles, Valve Misconceptions

Valve leakage is one of the main issues in industrial processes. Different valve leakage standards are specified by different organizations. Valves go through pressure tests which determine if they provide allowable leakage, zero leakage, or are bubble tight. Allowable leakage: Some valves have an allowable leakage rate. These rates differ depending on what organization sets

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The Building Blocks of Severe Service Valves (SSVs)

Articles, Severe Service Valves

Most of us know when an application is severe. But what is it that makes it severe for a valve? Defining Severe Service Valves (SSVs) objectively is an important tool in attaining improved process control, safety, profitability, and environmental stewardship. SSVs can be defined as industrial valves specifically designed to perform in the most extreme

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