Flow Control Valves
On the other hand, the bolt ball valves can be cleaned, repaired and repaired in one piece, but special tools are required for disassembly. When larger sizes and higher pressure ball valves are required, the design changes to the blunt style. The stump differs from the floating style in that the trunnion ball is held in the body by a stump at the bottom and by the stem at the top. Since the ball cannot “float” on the seat to achieve a positive closure, the seat must float to the ball.
These valves act as a collection mechanism for the food and oil processing industry. Tap valves are used to control the flow of liquid in basins or sinks and generally have no outlet connections, although some are threaded to connect the hose, often referred to as a bib or hose valve. The main specifications are the intended application, type of actuator, type of gate connection, current coefficient, averages, pressure classification and characteristics. Double locking and vent valves are mainly used in process control applications to turn off upstream pressure and vent fluid and / or system pressure.
Gate valves work when the user rotates the handle clockwise to close the movement or clockwise to open the movement. Engineers also use slide valves when ecozen minimal pressure loss and a free hole are required. Typical slide valves have no obstruction in the flow path, resulting in minimal pressure loss.
These valves are often used in liquid, soft drink and vapor applications that require airtight bubble closures. Although mainly used for low-pressure applications, ball valves with metal seats are suitable for high pressure and high temperature. They are available in smaller diameters and are suitable for liquids and gases operating under low to moderate pressures.
A slide valve is named after the internal mechanism that allows water flow. This mechanism looks like a small door moving up and down on a stem connected to the handle. The handle is a screw handle that moves the door up and down and opens and closes the valve if necessary. They are best used in on / off applications where the valve is not often used.
There are 2-way balloon valves that prefer accurate flow control and 3-way balloon valves that are often used to mix two-port input media and pass that mixture through an output port. The channel-shaped slide valve is common in the chemical process industry because it provides accurate flow control. The construction material for the slide valve is cast iron, carbon steel, stainless steel, ductile iron, bronze, nickel alloys, etc.
Balloon valves are used for closing and controlling and are used, for example, in wastewater installations, food processing installations and process installations. The most common variety is the Z-pillar valve, named after the path that follows the fluid through the valve body. These two right angle turns that the fluid must make through the valve represent the relatively high head losses of the design.
The main specifications include port settings, port connections, valve size, media and sealing material. Membrane valves are mainly used in the pharmaceutical, cosmetic, food and semiconductor industry. Sometimes control valves powered by pneumatic diaphragms are incorrectly called “membrane valves”.”The reader is warned to make this distinction. Carbon steel: very good mechanical properties; Good resistance to corrosion by voltage and sulfides.
Needle valves are used in vacuum systems and for measuring systems where accurate flow control is required. Due to the large number of bends required to close a needle valve, they are not ideal for use in shutdown applications. Like squeeze valves, the diaphragm completely shuts off the process fluid drive media, which is an advantage for plumbing valves.