PBQ940H-16C-DN1600 Large Diameter Eccentric Hemisphere Valve

PBQ940H-16C-DN1600 Large Diameter Eccentric Hemisphere ValveIt has the characteristics of low opening force, breaking down scaling obstacles when closing, achieving good sealing performance, and is wear-resistant. The wear-resistant and corrosion-resistant material of eccentric hemispherical valves is widely used in two-phase media such as water, steam, sewage, petrochemicals, natural gas, solutions and slurries, as well as ideal transmission equipment for dust and gas.

Eccentric hemispherical valve is a practical operation type product, equipped with a hydraulic actuator on its actuator, which is more convenient for users to operate, lightweight, and remotely automated. It has developed the application range of hemispherical valves, especially in harsh environments where it is inconvenient to operate manually or normally open, and is matched with automated computer operation.

PBQ940H-16C-DN1600 Large Diameter Eccentric Hemisphere ValveThe structural principle of the valve is the offset size between the centerline of the hemisphere and the centerline of the valve stem, and the offset size between the hemisphere and the centerline of the valve seat. When fully opened, the sphere disengages from the valve seat with a certain gap, and the turning radius is divided into long radius and short radius. The tangent of the long radius rotation trajectory forms a θ angle with the sealing surface of the valve seat. When the valve is opened and closed, the hemisphere has a gradual disengagement and compression effect on the valve seat surface, thereby reducing mechanical wear and abrasion between the valve seat and hemisphere during opening and closing, and reducing the service life.

Large caliber eccentric hemispherical valve [Product standard specification]:

1. Design and Manufacturing: GB/T12237

2. Pressure test: GB/T13927

3. Flange connection size; GB/T9113.1-9113.4、 GB/T17241.6、JB/T79.1-79.4 、HG20596

Large caliber eccentric hemispherical valve [suitable for industrial and mining]:

It can be widely used in pipeline systems containing various media such as fibers, solid particles, dust, slurry, sewage, and easy crystallization, for opening and closing and regulating flow.

Large caliber eccentric hemispherical valve :

1. The product adopts a hemispherical structure and is installed horizontally. After opening, the hemispherical body is located above the channel and separates from the channel, so the valve has a large flow capacity and does not deposit impurities

2. The hemisphere adopts a three eccentric structure, which quickly disengages from the valve seat when opened, effectively preventing frictional damage to the sealing surface and reducing the operating torque, thereby extending the service life of the valve.

3. The high hardness sealing surface of the hemisphere, when combined with the metal valve seat, has a shearing effect and can cut through iron wires and various fiber fabrics without entanglement or deposition.

Large caliber eccentric hemispherical valve :

1. The eccentric hemispherical valve consists of main components such as valve body, eccentric shaft, valve cover, ball crown, shaft sleeve, and valve seat. The valve is opened and closed by rotating the eccentric shaft 90 °, which plays a role in cutting off the medium.

2. The eccentric half ball valve ensures that the valve seat and ball crown do not rub against each other during the opening or closing process. The eccentric half ball valve uses an eccentric crankshaft, causing the center line of the ball crown to deviate from the center line of the valve flow channel by an eccentric distance. When the valve is opened, the crankshaft rotates a small angle, and the ball crown will leave the valve seat, and the ball crown and valve seat will no longer be in contact; On the contrary, during the valve closing process, the ball crown only comes into contact with the valve seat at the moment of closure.

3. The eccentric hemispherical valve adopts an upper mounted structure. During the maintenance process, it does not need to be disassembled from the pipeline. Only the bolts on the valve cover need to be removed, and the valve cover can be taken out to remove the eccentric shaft. This ensures that the valve can be repaired online.

4. The eccentric hemispherical valve should ensure smooth flow when opened and minimize head loss during operation. The sphere adopts a semi-circular channel, which has good flow performance and linear adjustment performance, and impurities will not deposit in the cavity of the valve body.

5. The eccentric hemispherical valve should have sufficient strength, and the eccentric crankshaft adopts a fixed ball structure without any vibration at high flow rates. The shell test should be carried out in accordance with the national standard GB13927-1992.

6. Eccentric hemispherical valves are not allowed to have external leakage, and at least 2 O-ring seals should be used to seal the upper and lower shaft ends.

7. The eccentric hemispherical valve has a cutting function, which can cut off impurities (tree branches, textile bags, etc.) in the medium when closed, ensuring the normal opening and closing of the valve.

Large caliber eccentric hemispherical valve :

1. Zero water loss. Adopting an eccentric structure, after the valve is opened, the flow channel is unobstructed and the head loss is zero. It can save a lot of energy.

2. Reliable sealing method. Soft sealing structure has self sealing performance, while hard sealing structure has elastic compensation performance.

3. Wear resistant and have a long service life. After the ball valve is opened, the ball crown is biased inside the valve body and is not directly flushed by the medium.

4. Automatic cleaning function. The edge of the ball crown of the hard sealed eccentric hemispherical valve is blade shaped, which can not only scrape off dirt on the valve seat, but also cut off debris.

5. Quick opening and closing. Eccentric crankshaft can be opened and closed by rotating 90 degrees, with short opening and closing time

6. Suitable for high flow rates. The straight channel and sturdy eccentric crankshaft make it suitable for high flow rates without vibration.

1. Applicable medium: Clear water Raw water (including sediment) Sewage Seawater, steam, coal gas, natural gas, oil products, etc.

2. Applicable temperature: Soft sealed eccentric hemispherical valve is -40 ℃ -135 ℃; Hard sealed semi valve is suitable for temperatures ranging from room temperature to around 600 ℃

3. Applicable pressure: PN6-PN64.

4. Nominal meridian: DN50~DN2200

Maintenance of large-diameter eccentric hemispherical valve products

Long term use may result in inadequate closure, improper operating torque, and loose closure. To achieve this, loosen the nut on the limit screw on the handwheel side of the worm gear reducer, rotate the handwheel, tighten the valve, tighten the limit screw, retract it halfway, and tighten the nut. If there is wear on the packing after long-term use, simply tighten the compression nut of the packing cover evenly until it does not leak (do not tilt the packing cover). If the packing needs to be replaced, the valve should be closed.

Main component materials of eccentric hemispherical valve

Performance Specification for Eccentric Hemisphere Valve

Main external dimensions of large-diameter eccentric hemispherical valve