Common sense of plumbing hardware: detailed explanation of pump valve sealing standards

①JB/T1472-1994 'Mechanical Seals for Chemical Pumps' This standard is applicable to rotary mechanical seals and other mechanical seals similar to rotating shafts. Pump mechanical seals include seven basic types: 103 type, B103 type, 104 type, B104 type, 105 type, B105 type, 114 type and 104a type (formerly GX type), B104a type (original GY type), and 114a type. Derived form. The structure and working parameters of the mechanical seal for pumps are shown in Table 5-36; Table 5-36 The form and working parameters of mechanical seals for pumps are 0.6~3 for the medium with high viscosity and good lubricity, and for the medium with small viscosity, The medium with poor lubricity is 0.3~3.

②JB/T7371-1994 'Mechanical Seals for Alkali-resistant Pumps' This standard is applicable to mechanical seals for alkali-resistant centrifugal pumps. It is divided into three basic forms: 167 (1105) double end face, multiple springs, and unbalanced; 168 type exterior, single end face, single spring, PTFE bellows type; 169 type exterior, single end face, multiple springs, PTFE bellow type.

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

③JB/T7372-1994 'Mechanical Seals for Acid-resistant Pumps' This standard is applicable to mechanical seals for acid-resistant pumps. It is divided into four basic forms: 151 type exterior, single end face, single spring, and PTFE bellows type; 152 type exterior, single end face, multiple spring, PTFE bellows type; 153 type interior, internal flow, single end face, multiple spring, PTFE bellows type; 154 type interior, internal flow, single end face, single Spring, unbalanced type.

In addition to the four basic forms, there are three derivative forms of 152a, 153a and 154a. The working parameters of the mechanical seal for acid-resistant pumps are shown in Table 5-39, and the main dimensions are shown in Table 5-40.

④JB/T8723-2008 'Mechanical Seal of Welded Metal Bellows' This standard applies to mechanical seals of welded metal wave tubes for centrifugal pumps and similar mechanical rotating shafts. The scope of application is: shaft diameter ping 20mm~120mm; seal cavity temperature- 40~400℃; pressure in the sealed chamber, single-layer bellows ≤2.2MPa, double-layer bellows ≤4.2MPa; speed, rotating type end surface average linear velocity≤25m/s, static type end surface average linear velocity≤50m/s; medium , Water, oil, solvents and general corrosive liquids. Table 539 Mechanical seal working parameters for acid-resistant pumps. Corrosive liquids.