What is the waterline flange, and what is the difference between the common flange?
Outburst in order to increase the surface of the flange sealing surface and the contact friction between the pads and sealing, and sealing surface there are two interfaces for the concentric circles of the triangle groove (commonly known as water line), as shown in figure (a). Two waterline grooves were converted to the waterline, which improved the sealing of the flanged flanges, but the condition was that soft gaskets must be used. HG 20592-1997 only specifies the sealing surface of the flanged flanges, while HG 2052-2009 stipulates that all three of these flanges are covered in the waterline.
The common flanges are flanged flanges (also known as flat flanges), concave convex flanges, and mortise flanges 3 kinds of flanged flanges, as shown in the image. Tu face flange sealing surface is flat, and gasket contact area is larger, preloaded, or move the gasket is easy to extend, poor sealing, only suitable for low pressure situation. The concave and convex flanged flanges, the jointed face flange sealing is better, suitable for the occasion of higher pressure.
Line is divided into three kinds, one kind is spiral, concentric circles, and three water ridge line and the comparison of helix, take some thin concentric circles of the helix. The three lines of water are made according to the customer's requirements, and the customer is not required to make the car 2mm wide and 1mm wide
The waterline flange is the flange with the waterline. For the flanges of the same type of sealing surface, the sealing effect is better when the sealing surface has waterline, and the pressure is higher. Line no specific standards, are generally not custom processing, mainly divided into three kinds, one kind is spiral, concentric circles, and three water ridge line and helix dense, take some thin concentric circles of the helix. Condition 1 ~ 3. The usual structure is: to reverse the right triangle (section), according to the requirement, usually 2mm wide and 1mm deep. The effect is to form a labyrinth seal when the flange connection is connected, reducing the leakage of gas or liquid. In addition, if the flange connection adopts non-metallic seal gasket, it is generally processed to seal the waterline. If the metal gasket seals, the waterline is not processed.
The waterline, also called the thread, is the thread. In the hg20592-97 standard: non-metallic flat gaskets for the flanged flanges of PN less than or equal to 4.0 MPa; When using polytetrafluoroethylene coating pads and flexible graphite composite MATS, the waterline is made by the car, and the sealing surface is the RF (A). Hg20592-2009 standard: surface, concave/convex and full-planar sealing surface is a kind of serrated concentric or spiral groove that is naturally formed when processing tool. The rounded radius of the machining tool should not be less than 1.5 mm, forming the zigzag concentric circle or spiral groove depth about 0.05 mm, the pitch range is 0.45-0.55 mm. The distance and depth of the exit flange are generally determined by the customer, usually 0.3 mm - 1mm wide. The standard welding flanges, the sliding flanges generally require a width of 0.5 to 0.7 mm. The flat-panel flanged client generally requires a width of 0.7 to 1mm and a depth of 0.5 to 0.8 mm.
