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　　1, JB/T7371-1994 “alkali pump mechanical seal” the standard applies to alkali centrifugal pumps with mechanical seals, is divided into three basic forms: 167 (1105) - double-end face, multi-spring, non-equilibrium type; 168 - external, single-end face, single-spring, polytetrafluoroethylene bellows; 169 type Externally mounted, single face, multi-spring, PTFE bellows type.

　　Working parameters: sealing medium pressure 0 ~ 0.5MPa; sealing medium temperature is not higher than 130 ℃; speed is not greater than 3000r/min; shaft diameter 107 type 28 ~ 85mm, 168 type 30 ~ 45mm, 169 type 30 ~ 60mm; medium for sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, calcium carbonate, potassium carbonate and other alkaline liquids, of which the caustic concentration is not greater than 42%, and the concentration of caustic is not greater than 42%. The concentration of caustic soda is not more than 42%, and the content of solid-phase particles is less than 20%.

　　2, JB/T1472-1994 “chemical pumps with mechanical seals,” the standard applies to rotary mechanical seals and other similar rotary shaft mechanical seals. Pump mechanical seals including 103 type, B103 type, 104 type, B104 type, 105 type, B105 type, 114 type seven basic forms and 104a type (former GX type), B104a type (former GY type), 114a type three derivative forms. Pump mechanical seal of the structure of the form and working parameters in Table 5-36; Table 5-36 pump mechanical seal of the form and working parameters ① viscosity, lubrication of the medium to take 0.6 ~ 3, the viscosity is small, poor lubrication of the medium to take 0.3 ~ 3.

　　3, JB/T8723-2008 “welded metal bellows mechanical seal” the standard applies to centrifugal pumps and similar mechanical rotary shaft with welded metal bellows mechanical seal, the scope of application: shaft diameter ping 20mm ~ 120mm; seal cavity temperature -40 ~ 400 ℃; seal cavity pressure, single bellows ≤ 2.2MPa, double bellows ≤ 4.2MPa; speed, rotary type Speed, rotating type, the average speed of the end face ≤ 25m/s, static type end face average speed ≤ 50m/s; medium, water, oil, solvents and general corrosive Table 5-39 Acid-resistant pumps with mechanical seals for corrosive liquid working parameters.

　　4, JB/T7372-1994 “acid-resistant pump mechanical seals,” the standard applies to acid-resistant pump mechanical seals, is divided into four basic forms: 151 type - external, single-end face, a single spring, polytetrafluoroethylene bellows type; 152 type - External, single end face, multi-spring, PTFE bellows type; Type 153 - internal, internal flow, single end face, multi-spring, PTFE bellows type; Type 154 - internal, internal flow, single end face, single spring, non-equilibrium type.