How do I identify a valve?
The tag itself should identify the valve, usually by showing the valve number. The type of valve and the system the valve is part of typically are identified. For example, the valve tag might read “200# Main Steam Shut Off.” This identifies the valve as the shutoff valve in the 200-pound main steam line.
How are valves named?
Most valves are named, the design of their disks. The seat or seal rings provide the seating surface for the disk. A valve may have one or more seats. In the case of a globe or a swing-check valve, there is usually one seat, which forms a seal with the disc to stop the flow.
What is a DA valve?
These valves are especially useful for either throttling or on/off control of liquids or gases which are gritty, sticky, or have a tendency to build-up on internal valve parts. The DA valve is also useful in angle piping or other applications where a self-draining valve is desired.
Who is the valve logo?
Valve’s Ray Ueno stated he worked with Gabe Newell and their colleagues to develop the “guy in the logo” when they decided to call the company “Valve” around 1995-1996, and needed to develop the visual brand vocabulary to go along with it.
Which instruments have piston valves?
Cylindrical piston valves called Périnet valves (after their inventor François Périnet) are used to change the length of tube in the playing of most brass instruments, particularly the trumpet-like members of the family (cornet, flugelhorn, saxhorn, etc.).
How many types of piston valves are there?
Piston valve is of two types, balanced and unbalanced. Balanced valve is used in high pressure services and unbalanced one for low pressure services.
What does a spring check valve do?
Spring check valves typically have hollow bodies and a large stopper, which receives constant pressure from a spring. When gas or fluid flows forward at sufficiently high pressure, the force will overcome the pressure from the spring and cause the stopper to open, allowing the desired flow.
What is a piston valve used for?
A piston valve is a device that is used to control the motion of a fluid along a tube or pipe by means of the linear motion of a piston within a chamber or cylinder. Piston valves are used for fully open or fully closed for on/off regulation on steam, gas, and other fluid services.
What is a valve valve?
Valves are typically constructed primarily from pipe fittings and machined plastics or metals. The inside of a piston valve contains a piston that blocks the output when the valve is pressurized, and a volume of air behind the piston.
When was the first piston-valved instrument invented?
The first piston-valved musical instruments were developed just after the start of the 19th century. The Stölzel valve (invented by Heinrich Stölzel in 1814) was an early variety. In the mid 19th century the Vienna valve was an improved design.
What is the difference between piston valves and rotary valves?
In the mid 19th century the Vienna valve was an improved design. However most professional musicians preferred rotary valves for quicker, more reliable action, until better designs of piston valves were mass manufactured towards the end of the 19th century. A piston valve can also refer to a 2-way 2-position, pilot-operated spool valve.