First, the product overview

Eccentric hemispherical valve is a new product developed successfully in absorbing and digesting advanced technologies both at home and abroad. It is also an innovative product that fills up gaps in the domestic valve variety. Under the precondition of carefully weighing the advantages and disadvantages of many kinds of valves, such as ball valves, butterfly valves and gate valves, Similar products and the development of all domestic innovative products, the appraisal concluded that: in some aspects of the use of performance superior to gate valves, globe valves and ball valves and other similar products used in petroleum, chemical, power and metallurgical industries, the core Technology is a national initiative, its unique design, novel structure. Since the products on the market, by the customer's approval.

First: the valve structure using eccentric tight principle, through the transmission mechanism to achieve the purpose of tight, adjust, close, the ring and the ball are metal surface ring with hard-surface contact seal, double eccentric structure when the ball valve hidden in the valve Cavity, the circulation surface, and the valve is not washed, no flow. When closed, the valve core is not washed away. When the valve core is closed, the spherical surface of the valve core gradually advances along the valve seat. With the cutting function, the fouling barrier can be effectively removed and a reliable seal can be achieved. It is particularly effective on media that is prone to fouling.

Second: the valve and the hemisphere with bimetal, welding different alloys in the sphere, the valve seat is also the corresponding surfacing alloy, the special treatment, the sealing surface into anti-corrosion, wear-resistant, high temperature and other types to meet Different occasions demand.

Third: tight seal, conveying harmful gases up to zero leakage. 

Fourth: the valve seat and the ball left a compensation amount, when the valve seat wear, turn off a little while turning, still reliable seal, to extend the service life, in addition, the user will be a plate screw off, re-adjust or replace the seat Still available, to avoid the failure of many valve seal failure of the entire scrap. According to the needs of users welding different alloys, bimetal ring matching can be used for wear-resistant, corrosion-resistant, high temperature but also require strict sealing of different industrial sectors.

Second, the main purpose of the product and product features

1, common valve: suitable for sewage treatment, pulp, alumina, urban heating and heating requirements of the occasion. 
2, special valve for the oil chemical industry: suitable for crude oil, heavy oil and other oil products, chemical industry corrosion-resistant, two-phase mixed flow medium. Temperature up to 425 ℃. 
3, gas valve: suitable for gas, natural gas, liquefied gas transport control. Product structure is characterized by ring seal welding valve containing different chromium alloy, tight seal, anti-corrosion. 
4, slurry-specific valve: suitable for liquid, solid two-phase mixed flow or liquid transport Chemical reaction crystallization or scaling of industrial pipelines. Product Structure Features According to the media required by customers, different temperature requirements, the ball adopts chromium-molybdenum and vanadium alloy surfacing, and the valve seat adopts chromium, molybdenum alloy, chrome alloy and stainless steel alloy electrode surfacing to meet the needs of different slurry conveying. 
5, special coal ash slag valve: suitable for power plants, hydraulic slag or gas delivery pipe control. Product requirements wear-resistant performance, the ball with a combination of ball bimetal, has a very high stiffness and is very wear-resistant, the seat with the whole wear-resistant steel or full surfacing.

Third, the main dimensions