- SWING CHECK
- DUAL CHECK
- TILTING CHECK
- PARALLEL SLIDE
- STAINLESS STEEL
- BELLOWS SEAL
- THROUGH CONDUIT
- NON RETURN
■ YOKE SLEEVE The upper portion of the Yoke Sleeve is hexagonally tapered to fix the handwheel. The standard material of the Yoke Sleeve is Nodular Ni-resist D2 with over 1150℃(2100℉) dissolutiio...
■ YOKE SLEEVE The upper portion of the Yoke Sleeve is hexagonally tapered to fix the handwheel. The standard material of the Yoke Sleeve is Nodular Ni-resist D2 with over 1150℃(2100℉) dissolutio...
Pressure Seal bonnet Gate valve는 body와 bonnet사이에 gasket를 넣어 body의 내압에 의해 bonnet를 밀어 올려서누설을 방지하는 고온고압 발전소에 가장 많이 사용되고 있다. Bolt로 체결하지 않는구조로 Top Flange가 없고 bolted bonnet valve보다 면간거리가 짧아 중량이 가볍고 주로 맞대기 용접으로 배관에 부착한다.
■ YOKE SLEEVE
The upper portion of the Yoke Sleeve is hexagonally tapered to fix the handwheel. The standard material of the Yoke Sleeve is Nodular Ni-resist D2 with over 1150℃(2100℉) dissolutiion point in accordance with API Std. specifications
The bonnet is of a steel forging identical to the body to insure high reliability. The bonnet has a perfect body-bonnet seal and both ease of dismantling and reassembly are ensured. the bodies and bonnets of the valve are machined by special purpose machines to achieve perfect coaxiality and eliminate any misalignment which may damage th stems.
The machined forged stem comes with a T-shape head, which connects the slot of the wedge. The contacting surface of the head spherically shaped, thereby giving it greater strength and durability. It is heat treated to give it adequate mechanical properties and surface hardness. Accurate machining and lapping insure minimized friction during opening and shutting.
■ BACK SEAT
All of our valves are provided with positive backseat, and packing replacement can be done with the valve fully open. the conical seat and the guide are integrally stellite faced.
■ SEAT RING
The stellite 6 surface of the seat ring is integrally applied to the body by means of welding in all valve sizes. Lapping applied to the seating surface ensures perfect mating with the wedge surfaces.
■ FLEXIBLE WEDGE
The flexible wedge designed to absorb thermally-induced body distortion, thereby making it ideal for high temperature steam or water supply piping. A Stellite 6 layer is applied to the seating surface, and this deposit is subjected to a special heat treatment to secure required hardness and soundness. The lapped finish then insures perfect mating with the seats.
The valve body is cylindrically shaped to prevent distortion or undue stress during extreme working conditions. In addition, adequate padding helps to achieve a sound cast structure in critical area. The wall thickness is greater than, or in accordance with API, ANSI and ASME requirements. the contact surfaces ensure that a minimum specific pressure is achieved. The area contacting the pressure seal gasket has a stainless steel 18/8 inlay to eliminate corrosion or wire drawing and to insure easy dismantling at all times. The close tolerances of the inside diameter of this area are attained by accurate machining and honing finish.
Bolted bonnet Gate valve는 body와 bonnet사이에 gasket를 넣어 bolt로 체결하여 body와 bonnet사이의 누설을 방지하는 구조로 석유확용 밸브에 가장 많이 사용되고 있다. Gate Valve의 용도는 Disc를 완전히 열거나 닫아서 사용하는것으로 유체를 차단하는 것이 주된 용도이다. 기본적으로 긴급하거나 빈번한 개폐 조작을 중요시 하지 않는 배관에 사용된다
■ YOKE SLEEVE
The upper portion of the Yoke Sleeve is hexagonally tapered to fix the handwheel. The standard material of the Yoke Sleeve is Nodular Ni-resist D2 with over 1150℃(2100℉) dissolution point accordance with API Std. specifications.
The body-bonnet bolts are manufactured in accordance with API Std. 600 specifications. The nuts also strictly conform with ANSI B 1.1 The stud-bolt nuts, hexagonal, rigid and hot-forged, bear material notation as well as do the bolt nuts made according to ANSI B18.2.2
The machined forged stem comes with a T-shape head, which connects the slot of the wedge. The spherically shaped contacting surface of the head gives greater strength and durability. The stem dimensions are in accordance with API Std. 600 specifications. The heat treated stem delivers adequate mechanical properties as well as excellent surface hardness. Further, opening/shutting friction is minimized by accurate machining and lapping.
■ SEAT RING
Bottom seated type seat rings are welded or screwed into the body. The seating surface is finished by lapping. the are forgings that have been heat treated to delived the best mechanical properties and required hardness. The difference in hardness between seats and wedge is in accordance with API specifications.
■ FLEXIBLE WEDGE
The standard disc of our valves is a one-piece flexible wedge. Slots are machined on both sides of the wedge to allow it to travel correctly in the integrally cast body guides. The wedge seating surfaces have been accurately machined, grind and lapped to a mirror finish to prevent leakage and eliminate galling.
The cast steel body is designed to insure a wall thickness which is grater at any point than the minimum specified by API Std. 600. Special care has been taken with the design of h\the Class 150 valve body so that the elliptically shaped center section is free from intensified stresses in the critical area. The body of above Class 300 are made circular in shape as much as possible to minimize distortion even under extreme operating conditions. Inlet and outlet port dimensions conform with ANSI B16.5 Pipe Fitting. The welded-in type seat ring is standard to insure interchangeability. Except for Class 150, the standard body-bonnet joint is male and female.