Welding Neck Flanges are easy to recognize at the long tapered hub, that goes gradually over to the wall thickness from a pipe or fitting.
The long tapered hub provides an important reinforcement for use in several applications involving high pressure, sub-zero and / or elevated temperatures. The smooth transition from flange thickness to pipe or fitting wall thickness effected by the taper is extremely beneficial, under conditions of repeated bending, caused by line expansion or other variable forces.
These flanges are bored to match the inside diameter of the mating pipe or fitting so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. They also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection.
This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld).
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Eccentric hemisphere valve features
Small size, eccentric hemispherical valve by rotating valve to make the valve clear or blocked. Ball valve switch light. Can be made into a large caliber, reliable seal, simple structure, easy maintenance, sealing surface and the spherical surface is often closed, easy to be media erosion, the industry has been widely used. Eccentric hemisphere valve is a relatively new type of ball valve, has its own unique structure of some advantages, such as friction switch, the seal is not easy to wear, opening and closing torque is small. This will reduce the size of the actuator fitted. With multi-turn electric actuator, the media can be adjusted and cut off. Eccentric hemispherical valve structural features: 1 open and closed without friction. This feature completely solves the problem of conservative [wiki] valves that affect the seal due to friction between the seal faces. 2 upload structure. Valves installed on the pipeline can be directly online inspection and maintenance, can effectively reduce the device parking, reduce costs. 3 single seat design. Elimination of the valve cavity medium due to abnormal pressure and affect the use of safe problems. 4 low torque design. Special structure design of the valve stem, just with a small handle valve can easily open and close. 5 wedge seal structure. Valve is provided by the stem of the mechanical force, the ball wedge pressed to the valve seat and seal, so that the valve seal from the impact of pressure changes in the pipeline under various conditions have a reliable guarantee of sealing performance. 6 sealing surface of the self-cleaning structure. When the sphere is away from the valve seat, the fluid in the pipeline passes through the sealing surface of the sphere evenly through 360 °, which not only eliminates the local erosion of the valve seat by the high-speed fluid but also rushes away the accumulations on the sealing surface to achieve the purpose of self-cleaning .