Type and Standard of Rubber Gasket

Definition: Gasket is a mechanical seal between two objects, usually used to prevent pressure, corrosion, and pipeline natural thermal expansion and cold contraction leakage between two objects. Because the machining surface cannot be perfect, the irregularities can be filled with gaskets. Gaskets are usually made of sheet materials, such as pad paper, rubber, silicone rubber, metal, cork, felt, neoprene, nitrile rubber, glass fiber, or plastic polymers (such as PTFE).Gaskets for a specific application may contain asbestos. The gasket (washer) is a vulnerability in the sheet (usually round) (usually in the middle) that is usually a load thread fastener for distribution. Other uses are used as intervals, springs (Belleville gaskets, wave pads), wear-resistant pads, pre-display devices, and lock devices. Rubber gasket is also used in the faucet (valve) to cut off the flowing liquid or gas. Rubber or silicon gaskets can also be used to reduce the vibration of the fan. Usually the outer diameter of the gasket is about twice the inner diameter.

Type: Gaskets can be divided into non-metal gasers, metal gasers, metal-nonmetal combination gasers, and can be finely divided into several kinds.

1. Non-metallic gaskets: rubber gaskets; no asbestos fiber rubber gaskets; flexible graphite metal composite gaskets; polyTeflon gaskets; PVC coated gaskets; other types of non-metallic material gaskets. 2. Metal-non-metal composite gaskets; waveform gaskets; metal winding gaskets; metal toothcomposite gaskets; metal coated gaskets; metal corrugated composite gaskets; other types of metal composite gaskets. 3. Metal gaskets; metal flat gasers; metal corrugated gaskets; metal tooth gaskets; metal ring gaskets; metal lens gaskets; metal O-ring pads. The metal ring pad can be divided into: octagonal ring pad; oval ring pad; RX and BX type self-tension sealing ring pad.

Gasket standard: GB/T 4622.1-2009  Winding type gasket classification; GB/T 4622.2-2008  Gasket size for winding washer tube flange;GB/T 4622.3-2007  Technical conditions of winding gasket;GB/T 9126-2008  Non-metal flat gasket size for tube flange;GB/T 9128-2003  Size of metal ring pads for steel pipe flanges;GB/T 9129-2003  Technical conditions for non-metal flat gasket for tube flange;GB/T 9130-2007 Technical conditions for metal ring cushion for steel pipe flange;GB/T l3403 2008 Gaskets for large diameter steel pipe flange;GB/T l3404-2008 Pipe flanges are coated with non-metallic Plon；GB/T l5601-1995 Pipe flange coated with metal；GB/T l9066.1-2008 Flexible graphite metal tooth composite gasket size；GB/T l9066.3-2003 Technical conditions of flexible graphite metal corrugated tooth composite gasket；GB/T l9675.1-2005 Size of flexible graphite composite gasket for pipe flange；GB/T l9675.2-2005 Technical conditions of flexible graphite composite gasket for metal punching plate for pipe flange；JB/T 87-1994 Asbestos rubber gaskets for pipe flange；JB/T 88-1994 Metal tooth gasket for pipe flange；JB/T 89-1994 Metal ring pad for pipe flange；JB/T 90-1994 Winding gasket for pipe flange；JB/T 6369-2005 Technical conditions of flexible graphite metal winding gasket；JB/T 6618 2005 Technical conditions of PTFE belt for metal winding pad；JB/T 8559-1997 metal jacketed gasket；JB/T l0688-2006 Technical conditions of PTeflon Gasket； JB/T l0689-2006 Technical conditions of puffed PTFE sealing belt；SH 340111996 Asbestos rubber plate gasket for tube flange；SH 3402 1996 Tube flanges are coated with Ps；SH 3403-1996 Metal ring pad for pipe flange；SH 3407-1996 Winding gasket for pipe flange；HG/T20592~20635-2009 Steel pipe flange, gaskets, fasteners；

Related standards: GB / T 539-2008 Oil-resistant asbestos rubber plate; GB / T 540 2008 oil-resistant asbestos rubber plate test method; GB 912-2008 Carbon structural steel and low-alloy structural steel hot-rolled thin steel plate and steel strip; GB / T 3280-2007 stainless steel cold-rolled steel plate and steel strip; GB / T 3985-2008 asbestos rubber sheet;GB / T 4238-2007 heat-resistant steel steel plate and steel strip; GB / T 5574-2008 Industrial rubber plate; GB / T ll253-2007 Carbon structural steel cold-rolled thin steel sheet and steel strip; JB / T 6628-2008 flexible graphite composite reinforcement (plate) pad; JB / T 7758.1-2008 fluorine content of flexible graphite plate; JB / T 7758.2-2005 flexible graphite board technical conditions; JB / T 7758.3-2005 sulfur content determination method of flexible graphite plate; JB / T 7758.4 2008 Method of determining chlorine content of flexible graphite plate;

JB / T 7758.5-2008 flexible graphite plate line expansion coefficient determination method; JB / T 7758.6-2008 flexible graphite board Shaw hardness test method; JB / T 7758.7-2008 flexible graphite plate stress relaxation test method; JB / T 9141.1-1999 flexible graphite plate density test method;

Installation requirements: Gasket-Seal gasket Installation requirements: 1. The sealing pad and flange sealing surface shall be cleaned without any scratches, spots and other defects affecting the connection and sealing performance. 2. The outer diameter of the sealing gasket should be smaller than the flange sealing surface, the inner diameter of the sealing gasket should be slightly larger than the inner diameter of the pipeline, the difference between the two inner diameter is generally twice the thickness of the sealing gasket, to ensure that the inner edge of the sealing gasket does not extend into the container or pipeline, so as not to hinder the flow of fluid in the container or pipeline.3. The pre-tightening force of the sealing gasket shall not exceed the design regulations to avoid the excessive compression of the sealing gasket and losing the rebound capacity. 4. When the sealing gasket is pressed, it is best to use a torque wrench. For large bolts and high strength bolts. The tightening torque shall be calculated according to the given tightness of the sealing gasket, and the oil pressure of the hydraulic compsier shall also be determined by calculation.5. When installing the sealing gasket, the nuts should be tightened in sequence. But should not twist once to reach the design value. Generally should cycle at least 2~3 times, so that the sealing gasket stress is evenly distributed. 6. For pressure vessels and pipes of flammable and explosive media, safety tools should be used when replacing sealing gaskets, so as to avoid sparks when the tools touch with flanges or bolts and cause fire or explosion accidents. 7. If there is leakage in the pipeline, the sealing gasket must be replaced or adjusted after lowering the pressure. Operation with pressure is strictly prohibited.