admin

Coaxial valves are 2-position valves that can be pneumatically or electrically actuated. The electric versions use an electromagnetic coil vs. a spring, similar to solenoid valves. The pneumatic versions use air pressure vs. a spring (spring return), or air pressure in both directions (double acting). Coaxial valves use a shuttle type obstructer that the media […]

Solenoid valves operate using a linear sliding obstructer that opens and closes the valve, or changes the flow from one outlet to another. There are many different types of obstructers used including plunger, shuttle, spool, and diaphragm. The linear motion is achieved by energizing an electromagnetic coil to pull the obstructer in one direction. A

These are very similar to a globe valves with 2 main differences. One, they are smaller and for finer control of flow on smaller lines. Two, instead of a disc shaped plug, they use a “needle” which has a conical shape, and moves in and out of an orifice. While effective as an on/off valve,

Globe valves operate by having a convex disc shaped plug raise and lower via a rising stem into a circular seat around the inside of the globe shaped body at the “equator”. The flow enters the “lower hemisphere” from one side, then travels up through the seat and exits through the outlet on the opposite

A gate valve functions by moving a wedge shaped disc obstructer up and down to open and close the flow path through the valve. This linear motion is provided by a threaded rising stem. Turning this threaded stem requires multiple revolutions (multi-turn) to travel from open to closed. The number of revolutions required is usually

In contrast to ball and plug valves, butterfly valves use a disc shaped obstructer. Basic, general duty butterfly valves are called “resilient seated”. They have a single seal ring that acts a a seal between the valve body and disc, as well as the seal between the pipe flanges and valve body. When the disc

The basic construction of a plug valve is practically identical to that of a ball valve with the exception of the shape of the obstructer used. In this case, the ball is replaced by a slightly tapered cylinder. This cylinder has a bore through it just like a ball valve, and it operates the same

Quarter-turn 2-way ball valves are by far the most common type of process control valve. They are 2-way (inlet and outlet), 2-position (open and closed) valves that are used for shut-off or isolation of a system, or a loop or component within a system. The basic construction of a ball valve includes a ball as

There are 2 distinct types of linear valves: rising stem (multi-turn) and axial. While both valve types rely on the linear motion of the flow obstructer, they are very different in construction and operation. Multi-turn rising stem valves move the obstructer by the rotation of a threaded rod (stem) which is attached to the obstructer

These types of valves rely on the rotary motion of the flow obstructer In most cases this rotation is limited to 90 degrees (one quarter-turn), however, there are valves that operate using a larger degree of rotation and have more than 2 positions that are used in regular operation. Valves that are truly quarter-turn are