Two-way flow of hard touch ball valve main types and working principles Selection of two-way flow of hard touch ball valve ball valve Overview The world's most sophisticated, most cost-effective ball valve pipe network system most of the valves, mainly used to cut off and regulate the media, this part of the valve throughout the The proportion of the system, the amount of more demanding valve durability and cost-effective at the same time should be able to adjust and interrupt the media when the forward flow, pressure differential or repair can prevent media back flow, that is, with two-way cut off function . Recently, this part of the valve in the pipe network system, the main application of the globe valve, gate valve, butterfly valve and ball valve. Stop valve and gate valve, has a good two-way cut-off function, sealing performance and service life are good, are one of the ancestors of the valve, but the cut-off valve by the cut-off structure of the inherent limitations of the large operating torque, unable to produce large diameter, Currently on the market only to the largest DN400; gate valve is no regulatory function to regulate the flow of the gate there is a significant danger of falling off, and large gate valve with its huge shape and height, in the manufacturing and transportation difficulties. Butterfly valve compared with the gate opening and closing time is short, the operating torque is small, small installation space and light weight and other characteristics, the partial division of the valve instead of using butterfly valve. But always, the sealing performance of the butterfly valve has not fully met the market requirements. In addition to the midline rubberized butterfly valve can be sealed in both directions within a certain pressure range, the other structure is basically a one-way flow. The midline structure can not be popularized by rubber restrictions. After the improvement, a two-way butterfly valve with a stainless steel elastic plate structure appears on the market, but its price is high. Mainly used in petroleum, natural gas, gas and other media is more important pipeline, pipe network in general, especially the water system applications rarely. B) Valve plate: stainless steel; c) Valve stem: stainless steel; d) Sealing surface: Hard coating of cobalt based hardmetal . B) valve opening and closing flexible, not subject to the impact of media pressure level; c) seat and valve plate without opening and closing friction, with a closer and more tight tightness; d) Valve plate seal with seal compensation function; Bidirectional flow ballistic ball valve Scope of Supply a) Availability specifications and quantities see the valve list; b) with matching flanges, bolts, nuts; flange standard GB / T9119- 2000 series â…¡; c) the supplier considers necessary spare parts; d) the use of equipment within 1 year, where the quality of equipment, suppliers for free replacement. Two-way flow hard touch spin valve Technical parameters Bidirectional flow hard touch ball valve contact medium for the reservoir water, turbine oil or insulating oil, eccentric structure worm gear flange ball valve, the seal type of metal to metal seal, the drive form of worm gear drive . Rotary ball valve can flow in both directions, while the two-way sealing performance can meet the nominal pressure requirements.