Gas Stop Valve J41N
I. Introduction:
The gas shut-off valve J41N is a type of gas valve, also known as a liquefied petroleum gas shut-off valve (liquefied gas valve). This product has pressure resistance and corrosion resistance, and is used in urban liquefied petroleum gas storage stations, as well as in refineries and liquefied gas systems of petrochemical plants, serving as a shut-off device for controlling the medium. The gas shut-off valve uses molded polytetrafluoroethylene/soft graphite as the sealing packing, and the initial seal is provided by the packing gland. When dynamic seal leakage occurs due to wear, the packing gland nut can be adjusted, making it suitable for most high and medium pressure non-corrosive fluid conveying occasions.
II. Design Parameters:
Design and manufacture: GB/T12235-89
Flange connection: JB/T79-94, GB9113-2000
Structural length: GB12221-89
Nominal diameter: DN15~DN300mm
Nominal pressure: PN1.6, 2.5, 4.0MPa.
III. Principle and Structure:
1. When the handwheel is rotated clockwise, the valve stem moves downward, the valve disc descends to make the sealing surfaces fit, cutting off the passage. When rotated counterclockwise, it opens, and the upper seal comes into effect when the valve stem is lifted to the top position.
2. This valve is equipped with an additional upper seal. When the valve is in the open state, it forms a dual seal together with the packing, and also provides a certain degree of protection for the packing.
3. This valve uses nylon products as the sealing surface, the packing is soft molded packing, and the upper seal is also made of soft material, resulting in good sealing performance.
IV. Materials of Components:
Valve body, valve cover | Valve stem, valve disc | Sealing surface | Packing |
WCB | Stainless steel | Stainless steel and nylon | Polytetrafluoroethylene, nitrile rubber |
V. External Dimensions:
Nominal diameter DN(mm) | Main connection and external dimensions of J41N-25 type (mm) | |||||||||
L | D | D1 | D2 | b | f | Z-фd | H | H1 | Do | |
15 | 130 | 95 | 65 | 45 | 16 | 2 | 4-14 | 252 | 194 | 120 |
20 | 150 | 105 | 75 | 55 | 16 | 2 | 4-14 | 270 | 200 | 120 |
25 | 160 | 115 | 85 | 65 | 16 | 2 | 4-14 | 310 | 235 | 140 |
32 | 180 | 135 | 100 | 78 | 18 | 2 | 4-18 | 322 | 260 | 160 |
40 | 200 | 145 | 110 | 85 | 18 | 3 | 4-18 | 360 | 345 | 180 |
50 | 230 | 160 | 125 | 100 | 20 | 3 | 4-18 | 405 | 370 | 200 |
65 | 290 | 180 | 145 | 120 | 22 | 3 | 8-18 | 435 | 420 | 240 |
80 | 310 | 195 | 160 | 135 | 22 | 3 | 8-18 | 475 | 455 | 280 |
100 | 350 | 230 | 190 | 160 | 24 | 3 | 8-23 | 525 | 495 | 320 |
125 | 400 | 270 | 220 | 188 | 28 | 3 | 8-25 | 600 | 570 | 360 |
150 | 480 | 300 | 250 | 218 | 30 | 3 | 8-25 | 615 | 586 | 400 |
200 | 600 | 360 | 310 | 275 | 34 | 3 | 12-25 | 720 | 635 | 450 |
250 | 730 | 425 | 370 | 332 | 36 | 3 | 12-30 | 862 | 710 | 500 |
300 | 850 | 485 | 430 | 390 | 40 | 4 | 16-34 | 935 | 790 | 500 |
| Machinery & Equipment/Valves/Globe Valves | |
