Advantages:
1, flow resistance is small. Valve internal media channel is through the medium, linear flow, low flow resistance.
2, open and close more labor-saving. Is compared with the cut-off valve, because whether it is open or closed, gate movement direction are perpendicular with the medium flow direction.
3, big, highly open and close time long. Large gate opening and closing stroke, carried down through the screw.
4, not easy to produce water hammer phenomenon. The reason is shut down for a long time.
5, the medium can flow in any direction to the sides, easy to install. The valve channel is flanked by symmetrical.
6, the length of the structure (Department of housing two is connected between the end faces of the smaller distance).
7, form a simple structure with short length, good manufacturing process, wide application range.
8, the advantages of compact structure, good rigidity, smooth channel, small flow resistance, the sealing surface of stainless steel and hard alloy, long service life, using PTFE filler. The sealing is reliable. The operation is portable and flexible.
Disadvantages
Between the sealing surface can lead to erosion and abrasion, maintenance more difficult. Larger dimensions, requires a certain open space, opening and closing a long time. The structure more complex.
Parallel gate valve
Valve types, according to the sealing surface configuration can be divided into wedge gate valve and parallel gate valve, wedge gate valve can be divided into: single gate type, dual gate plate and the flexible gate type; parallel gate valve can be divided into single gate type, dual gate plate. Classified according to location of threaded stem can be divided into the next shot and the dark bar gate valve two.
Structure characteristics: general valve using the market long-term since the widespread existence of leakage or rusting
Hebei Shanghan Import&Export Trade Co., Ltd is one of the Chinese promising companies. It is a young company whose business operations cover a broad spectrum of international trade activities and equipment manufacturing and supply. Our factory built in 2004, it is located in the southeast of Hengshui.
Hebei Shanghan Import&Export Trade Co., Ltd serves as China's largest supplier of camping house and petroleum equipment, holding a dominant position in domestic petroleum equipment accessories. At the same time, Hebei Shanghan Import&Export Trade Co., Ltd is also a major supplier of refined oil products and petrochemicals. As one of the largest service suppliers in the global petroleum and petrochemical industries, Hebei Shanghan Import&Export Trade Co., Ltd can also provide operational services and technical support in such areas as geophysical prospecting, well drilling, logging, well testing, downhole operations, oilfield surface facilities construction, pipeline construction, refining and petrochemical projects, and manufacturing and supply of petroleum equipment.
By the end of 2012, there were 20 overseas exploration and production projects in 12 countries or areas such as Saudi Arabia, American, England, Kuwait, Libya, Iraq, Kazakhstan, Turkmenistan, Mexico, Russia, Venezuela, and Iran etc.
