Amie Brewer Valves April 14th, 2019 - 12:21:19
With the increase of the steam flow rate and pressure, the plug valve can not satisfy the number of steam admission and exhaustion at all. In order to solve the problem, people then invented the slide valve. In 1840, the check valve with threaded stem and the wedge gate valve with threaded stem become the great breakthrough in the valve field. The two valves did not only meet the requirement for pressure and temperature at that time but also initially satisfy the need for flow regulation. Later, because of the rapid development of power industry, oil industry, chemical industry and shipbuilding industry, all kinds of high or middle valves sprang up like mushrooms. What's more, after the Second World War, owning to the invention of new materials such as polymeric material, stainless steel, lubricating material, the old plug valve and butterfly valve gain the new application and the ball valve and diaphragm valve develop quickly.
These examples of Swagelok Valves give the customer great insight into the care, detail, quality, design and testing that goes into the manufacture of each and every Valve in the Swagelok catalogue. It's easy to see why Swagelok has no hesitation in backing their products with the Swagelok Limited Lifetime Warranty.
A gate valve that incompletely opened can cause pulsations as well as long-lasting pipe damage. Fluid friction can also impair the valves' seating portion if it is halfway opened. In valves like these, its design is particularly intended to block the flow completely or permitting the movement of liquid completely.
Sealability and strength property are the most basic and most important characters for all valves. The sealing of a valve can be separated into internal seal and external seal. The front one means the sealing between valve clack and seat. The latter one means the sealing between the moving part of the valve stem and bonnet, body and bonnet, body and connection part. When the valve is used, it should be not only good in sealability but also be safe.
A few more examples from Swagelok's incredibly large catalogue of Valves for every need include Bellows-seated Valves, made with 316L Stainless Steel constructions, with Swagelok tube fitting, weld, and VCR ® and VCO fitting ® ends. Other features include full pressure rating in either flow direction for system versatility, and that the Valves are easily purged to maintain clean operation. Another type of Valve manufactured by Swagelok is the Check Valve which allows fluid to flow in one direction only.
The fourth one is the disk valve which is also known as swing check valve. It operates in the same manner as ball and cone valves, but the plug that settles over the opening is a disk. Disk and cone valves tend to wear down more because they have more moving parts and because they get bumped around on top of the flow of water when it is turned on.