Water-sealed stop valve
I. Introduction:
The water seal stop valve is carefully selected in materials, conforming to relevant domestic and international standards. The matching of sealing surfaces is advanced and reasonable, which improves sealing performance and extends service life. The packing box of the water seal stop valve is designed as a water seal structure. After being filled with water at a pressure of 0.6 to 1.6 MPa, it has low friction, good sealing performance, can isolate the system from the atmosphere, and ensure excellent air tightness. It is an environmentally friendly product. The valve stem undergoes quenching and tempering and surface nitriding treatment, giving it good corrosion resistance, scratch resistance and wear resistance. The reverse seal of the water seal stop valve adopts stainless steel threaded connection seal or surfacing austenitic stainless steel on the body, ensuring reliable sealing. The replacement of packing can be carried out without stopping the machine, which is convenient and fast and does not affect the system operation. The product is designed and manufactured in accordance with the national standard GB/T12235, with novel structure and beautiful appearance. The connection ends are available in flanged and welded types, which can be matched according to different user requirements. It has a compact structure, flexible operation and convenient maintenance. The water seal stop valve is suitable for use in the return water condensation systems of thermal power plants with nominal pressure PN2.5 to 4.0 MPa and working temperature of 0 to 450 °C, as well as in pipeline systems of petroleum and chemical industries that require isolation from the atmosphere, to cut off or connect the medium in the pipeline. The applicable media are: water, oil products, steam and non-corrosive gases.
II. Product Features:
(1) The product is designed and manufactured in accordance with the national standard GB12235, with novel structure, reasonable material selection and beautiful appearance. The connection ends are available in flanged and welded types, which can be matched according to different user requirements.
(2) The packing box is designed as a water seal structure. After being filled with water at a pressure of 0.6 to 1.6 MPa, it has low friction, good sealing performance, and can isolate the entire system from the atmosphere to ensure excellent air tightness.
(3) The valve stem undergoes quenching and tempering and surface nitriding treatment, giving it good corrosion resistance and scratch resistance.
(4) It has a compact structure, flexible operation, convenient maintenance and long service life.
(5) The reverse seal adopts a stainless steel threaded connection seal seat or surfacing austenitic stainless steel on the body, ensuring reliable reverse sealing. The replacement and maintenance of packing can be carried out without stopping the machine, which is convenient and fast and does not affect the system operation.
III. Execution Standards:
Design and Manufacturing: JB/T3595
Structural Length: GB/T15188
Pressure-Temperature Class: GB/T3595
Testing and Inspection: GB13927, JB/T9092
IV. Component Materials:
Valve Body | Valve Cover | Valve Disc | Valve Seat | Valve Stem | Packing | Applicable Medium | Applicable Temperature (≤℃) |
WCB | 25+D507MO | 25+D577 | 2Cr13 | Flexible Graphite | Water, Oil Products, Steam | 425 | |
A105 | 2Cr13+Stellite12 | 2Cr13+Stellite6 | 2Cr13 | Flexible Graphite | Water, Oil Products, Steam | 450 | |
V. External Connection Dimensions:
Nominal Pressure | Nominal Diameter | Standard Value | Reference Value | ||||||||||
L | D | D1 | D2 | D6 | b | f | n | Z-φd | DO | H | Mass (kg) | ||
2.5 | 10 | 130 | 90 | 60 | 40 | 16 | 2 | 4-φ14 | 120 | 272 | 6 | ||
15 | 130 | 95 | 65 | 45 | 16 | 2 | 4-φ14 | 120 | 272 | 6 | |||
20 | 150 | 105 | 75 | 55 | 16 | 2 | 4-φ14 | 120 | 280 | 6 | |||
25 | 160 | 115 | 85 | 65 | 16 | 2 | 4-φ14 | 160 | 332 | 10 | |||
32 | 180 | 135 | 100 | 78 | 18 | 2 | 4-φ18 | 160 | 342 | 11 | |||
40 | 200 | 145 | 110 | 85 | 18 | 3 | 4-φ18 | 200 | 395 | 17 | |||
50 | 230 | 160 | 125 | 100 | 20 | 3 | 4-φ18 | 240 | 431 | 24 | |||
65 | 290 | 180 | 145 | 120 | 22 | 3 | 4-φ18 | 280 | 457 | 33 | |||
80 | 310 | 195 | 160 | 135 | 22 | 3 | 8-φ18 | 320 | 505 | 47 | |||
100 | 350 | 230 | 190 | 160 | 24 | 3 | 8-φ23 | 360 | 549 | 62 | |||
125 | 400 | 270 | 220 | 188 | 28 | 3 | 8-φ25 | 400 | 621 | 96 | |||
150 | 480 | 300 | 250 | 218 | 30 | 3 | 8-φ25 | 500 | 703 | 128 | |||
200 | 600 | 360 | 310 | 278 | 34 | 3 | 12-φ25 | 650 | 828 | 168 | |||
4.0 | 10 | 130 | 90 | 60 | 40 | 35 | 16 | 2 | 4 | 4-φ14 | 120 | 272 | 6 |
15 | 130 | 95 | 65 | 45 | 40 | 16 | 2 | 4 | 4-φ14 | 120 | 272 | 6 | |
20 | 150 | 105 | 75 | 55 | 51 | 16 | 2 | 4 | 4-φ14 | 120 | 280 | 6 | |
25 | 160 | 115 | 85 | 65 | 58 | 16 | 2 | 4 | 4-φ14 | 160 | 332 | 10 | |
32 | 180 | 135 | 100 | 78 | 66 | 18 | 2 | 4 | 4-φ18 | 160 | 342 | 11 | |
40 | 200 | 145 | 110 | 85 | 76 | 18 | 3 | 4 | 4-φ18 | 200 | 395 | 17 | |
50 | 230 | 160 | 125 | 100 | 88 | 20 | 3 | 4 | 4-φ18 | 240 | 431 | 24 | |
65 | 290 | 180 | 145 | 120 | 110 | 22 | 3 | 4 | 4-φ18 | 280 | 457 | 33 | |
80 | 310 | 195 | 160 | 135 | 121 | 22 | 3 | 4 | 8-φ18 | 320 | 505 | 47 | |
100 | 350 | 230 | 190 | 160 | 150 | 24 | 3 | 4.5 | 8-φ23 | 360 | 549 | 62 | |
125 | 400 | 270 | 220 | 188 | 176 | 28 | 3 | 4.5 | 8-φ25 | 400 | 621 | 96 | |
150 | 480 | 300 | 250 | 218 | 204 | 30 | 3 | 4.5 | 8-φ25 | 500 | 703 | 128 | |
200 | 600 | 360 | 310 | 278 | 260 | 34 | 3 | 4.5 | 12-φ25 | 650 | 828 | 168 | |
| Machinery & Equipment/Valves/Globe Valves | |
