Swing Check Valve는 응답 속도가 늦고, Water Hammer현상이 발생하여 종종 배관에서 문제가 발생한다.이러한 단점을 보완한 것이 Tilting Check valve로써 응답속도가 빠르고 Water Hammer 현상이 감소되는 장점을 가지고 있으며 주로 고온고압 발전소에 사용된다.
■ HINGE PIN
The hinge pin is inserted into the valve body to achieve pressure sea lconstruction.
The cover material is a steel forging identical to the body to insure high dependability. The cover construction has a perfect body-cover tightness and ease of dismantling and reassembly are ensured.
The disc has a sufficient seating surface area which is ground and lapped to a mirror finish. It is of one-piece construction and is heat treated to deliver the required mechanical properties and hardness.
■ SEAT RING
The Stellite 6 surface of the seat ring is integrally applied to the body by means of welding in all valve sizes.
Perfect mating with the DISC surfaces attained by a lapping finish applied to the seating.
The cylindrically shaped valve body prevents distortion or undue stress under extreme working conditions. Padding is also provided to achieve a sound cast structure in the critical areas. The wall thickness is greater than, or in accordance with, API, ANSI and ASME requirements. The area contacting the pressure seal gasket has a stainless steel 18/8 inlay to eliminate corrosion or wire drawing. The close tolerances of the inside
diameter of this area are attained by accurate machining and honing finish.