Globe밸브와 Check밸브의 기능 두가지를 가진 밸브로서 용도는 유체의 역류방지가 목적이다.유체가 한방향으로만 흐를수 있는 구조이다. 주로 고온고압 배관에 사용이 많으며 밸브의 Stroke를 조절하여 유량이나 압력을 조절 할 수 있다.유체가 역류시 Disc자중에 의해 밸브를 닫아 역류를 방지한다.
■ YOKE SLEEVE
The standard material of the Yoke Sleeve is Nodular Ni-resist D2 with over 1150℃(2100℉) dissolution point in conformity 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 body and bonnets of our valve are carefully machined to achieve perfect coaxiality and eliminate any misalignment which may cause damage stems.
The stem. of one-piece construction, is heat treated to secure the adequate mechanical properties and surface, hardness. Accurate machining and grinding insure that there is minimized friction during valve opening/shutting. The round head of the stem gives a point contact with the inside of the disc housing and thus prevents galling.
■ BACK SEAT
All of our valves are equipped with a backseat to allow packing replacement with the valve fully opened. The conical shape contact seat in the bonnet assmbly in integrally stellite faced.
The disc of our globes is a loose disc which freely revolves around the stem, thereby preventing friction and galling with the seating surface when the valve is shut. The outside diameter of the disc is accurately finished and cylindrical in shape to travel along the body guides. A stellite 6 layer is applied to the conical seating surface of the disc. This deposit undergoes a special heat treatment to secure the required hardness and soundness. In addition, the lapped finish insures a perfect mating with the seats.
The Stellite 6 seating surface is integrally applied to the body by means of welding in all valve sizes. Perfect mating of the disc surfaces is achieved by lapping applied to the seating surface.
The cylindrically shaped valve body prevents distortion or undue stress under extreme working conditions. In addition, adequate padding ensures a sound cast structure in the critical areas. The wall thickness is greater than, or in accordance with API, ANSI and ASME requirements. The close tolerances of the inside diameter of this area are attained by accurate machining and honing finish.