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 […]
Allowable Leakage vs. Zero Leakage vs. Bubble Tight Read More »
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
The Building Blocks of Severe Service Valves (SSVs) Read More »
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,
Defining Severe Service Valves Read More »
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
An Introduction to Severe Service Valves Read More »
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)
Class 150 Does Not Equal 150 psig Read More »
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
Types of Knife Gate Valves Read More »
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
What is a Knife Gate Valve? Read More »
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
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
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