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Valve History
Valves have come a long way from their beginnings, almost 2000 years ago. Technological advancements and human knowledge have continuously allowed new and improved designs to emerge in the valve industry. Technological advancements are paired with the need for valves to be better suited for the applications as industries need
What is a Guided Shear Gate Valve and why is it a Severe Service Knife Gate Valve?
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, have always played a big
Six factors to consider when buying a Severe Service Valve
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 be a benchmark and rating
Allowable Leakage vs. Zero Leakage vs. Bubble Tight
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 them. Common organizations for allowable
The Building Blocks of Severe Service Valves (SSVs)
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 conditions without failing. These conditions
Defining Severe Service Valves
There is no clear or universal industry definition or mechanism to describe and accurately define severe service valves (SSVs) and separate them from general purpose valves. Yet, such a definition would allow the industry to benefit from improved process performance, increased profitability, safety, and environmental protection. Most experts agree that SSVs are identified by applications, and that these applications are
An Introduction to Severe Service Valves
Severe Service Valves (SSVs) mean different things to different people. Until today, defining SSVs had little if any global agreement or recognition. That is about to change as the Manufacturers Standardization Society (MSS) has accepted an application to produce a Standard Practice of defining them. This article provides information about the selection of SSVs in all industries but focusses on
Class 150 Does Not Equal 150 psig
Pressure-Temperature Ratings for Valves When it comes to valves, there are guidelines in place to protect workers and the environment from valve failures and leakage. In this example, we are talking about how much operating pressure a valve can withstand at a specific temperature. This is known as a Pressure-Temperature Rating. Based on the material(s) of construction, the Pressure-Temperature ratings
Types of Knife Gate Valves
There are several versions of the Knife Gate Valve design. It is important to note that some Knife Gate Valves operate in harsh severe service applications, where as others simply cannot hold up in these conditions – they simply weren’t manufactured to do so. Two categories can be used to better differentiate between Knife Gate Valve designs: General Purpose/Fit-for-Purpose Knife
What is a Knife Gate Valve?
Knife Gate Valves (KGVs) were first created for the Swedish Pulp and Paper industry in the 1920s. The market demanded an inexpensive valve for pulp stock applications, and the revolutionary knife gate valve design was born. Since then, knife gate valves have traveled back and forth across the globe undergoing several alterations; the Push-Through Knife Gate was developed in the
Valve Standards
For consistency amongst manufacturers, valves are designed to meet established standards. These standards are set for valve performance, design, materials, and functionality. This article aims to cover the organizations responsible for establishing standards in valve manufacturing, along with common valve ratings and testing procedures. Valve Standards Organizations Valve standards are created by private entities that develop best practices in the
Valve Parts
Valves come in all sorts of shapes and sizes. This is also true with the parts that make up these valves. These components can be sorted into 4 main categories, with two of them being subcategories. Non-Pressure Containing Parts Pressure Containing Parts Valve Trim Resilient or Compressible Parts This article will cover each of these categories and how they are
Valve Basics
What is a Valve? A valve is a device that regulates the flow of gases, liquids, or loose materials through an aperture, such as a pipe, by opening, closing, or obstructing a port or passageway. Valves perform different functions to suit their applications. These functions are to isolate, control, and check. Depending on what function is needed, there are plenty
