Various connection methods for valves

flange connection

1: Flange connection is the most commonly used form of connection between valves and pipelines or equipment. It refers to a detachable connection in which flanges, gaskets, and bolts are interconnected to form a combined sealing structure. Pipeline flange refers to the flange used for piping in pipeline installations, and when used on equipment, it refers to the inlet and outlet flanges of the equipment. The flange connection is easy to use and can withstand high pressure. Flange connection can be applied to valves of various nominal sizes and pressures, but there are certain limitations on the operating temperature. In high temperature conditions, the flange connection bolts are prone to creep and leakage. Generally, flange connection is recommended to be used at a temperature of ≤ 350 ℃.

According to the shape of the joint surface, it can be divided into the following types:

Smooth type: Used for valves with low pressure. Processing is relatively convenient

Concave convex type: With high working pressure, medium hard gaskets can be used

Mortise and tenon type: It can use gaskets with large plastic deformation, which are widely used in corrosive media and have good sealing effect

Trapezoidal groove type: using elliptical metal rings as gaskets, used for valves with working pressure ≥ 60kg/square centimeter or high-temperature valves

Lens type: The gasket is in the shape of a lens and made of metal. Used for high-pressure valves or high-temperature valves with working pressure ≥ 100 kg/cm2

O-ring type: a newer form of flange connection, with a more reliable sealing effect than ordinary flat washers