The structural forms of J41B ammonia globe valve body are straight-through type, straight flow type and right angle type. Straight-through type is Z common structure, but its fluid resistance. Straight flow type fluid resistance is small, mostly used for solid particles or viscosity of the fluid. Right-angle type valve body is mostly forged, suitable for smaller throughput, higher pressure of the globe valve. The center flange is square structure, and the valve stem is connected by inter-stem.
J41B ammonia globe valve main performance specifications: applicable media: liquid, gas, ammonia, nitrogen, hydrogen.
J41B flange ammonia globe valve structure features.
1, the center flange is a square structure, the stem is connected by the stem.
2, the valve body sealing surface part of the ball convex, and the foot of the valve to line anastomosis sealing.
3、The sealing surface is made of pasteurized alloy, which has good sealing performance and long service life.
I. Stainless steel ammonia disconnecting valve J41B main parts materials:
Part Name | Valve body, valve cover | seals | packing material | Packing Gland | tappet | gaskets |
J41B-25C | cast steel | pasteurized alloy | Polytetrafluoroethylene Vinyl | carbon steel | Polytetrafluoroethylene Vinyl | |
J41B-25Z | gray cast iron | |||||
J41B-25P | stainless steels | stainless steels | ||||
J41F-25Z | gray cast iron | carbon steel | ||||
Second, stainless steel ammonia disconnecting valve J41B performance specification:
Nominal pressurePN（MPA） | test pressurePS（MPa） | Applicable medium | Applicable temperature（℃） | |
2.5 | 3.8 | Ammonia, Ammonia liquid, etc.
| pasteurized alloy | graphite |
4.0 | 6.4 | |||
Third, stainless steel ammonia globe valve J41B main dimensions and weight:
Nominal diameter | Size（mm） | |||||||||||
L | D | D1 | D2 | D4 | b | f | f1 | Z-Φd | mountain pass | write out (a prescription, check, invoice etc) | D3 | |
10 | 130 | 90 | 60 | 40 | 35 | 16 | 2 | 4 | 4-Φ14 | 165 | 185 | 110 |
15 | 130 | 95 | 65 | 45 | 40 | 16 | 2 | 4 | 4-Φ14 | 165 | 185 | 110 |
20 | 150 | 105 | 75 | 55 | 51 | 18 | 2 | 4 | 4-Φ14 | 170 | 200 | 120 |
25 | 160 | 115 | 85 | 65 | 58 | 18 | 2 | 4 | 4-Φ14 | 197 | 210 | 120 |
32 | 180 | 135 | 100 | 78 | 66 | 20 | 2 | 4 | 4-Φ18 | 199 | 213 | 140 |
40 | 200 | 145 | 110 | 85 | 76 | 20 | 3 | 4 | 4-Φ18 | 248 | 264 | 160 |
50 | 230 | 160 | 125 | 100 | 88 | 22 | 3 | 4 | 4-Φ18 | 265 | 295 | 180 |
65 | 290 | 180 | 145 | 120 | 110 | 24 | 3 | 4 | 8-Φ18 | 310 | 349 | 220 |
80 | 310 | 195 | 160 | 135 | 121 | 26 | 3 | 4 | 8-Φ18 | 340 | 357 | 240 |
100 | 350 | 230 | 190 | 160 | 150 | 30 | 3 | 4.5 | 8-Φ23 | 380 | 413 | 280 |
125 | 400 | 270 | 220 | 188 | 176 | 32 | 3 | 4.5 | 8-Φ25 | 430 | 451 | 320 |
150 | 480 | 300 | 250 | 218 | 204 | 32 | 3 | 4.5 | 8-Φ25 | 505 | 492 | 360 |
200 | 600 | 360 | 310 | 278 | 260 | 34 | 3 | 4.5 | 12-Φ25 | 550 | 806 | 400 |
250 | 650 | 425 | 370 | 335 | 31 | 36 | 3 | 4.5 | 12-Φ30 | 730 | 880 | 450 |
300 | 750 | 485 | 430 | 390 | 364 | 40 | 3 | 4.5 | 16-Φ30 | - | 995 | 550 |
Stainless steel ammonia globe valve J41B operation and precautions
Stainless steel ammonia globe valve belongs to the forced sealing type valve, so when the valve is closed, pressure must be applied to the valve flap to force the sealing surface not to leak. When the medium enters the valve from below the valve flap, the resistance that the operating force needs to overcome is the friction of the valve stem and packing and the thrust generated by the pressure of the medium, the force to close the valve is greater than the force to open the valve, so the diameter of the valve stem should be large, or else the failure of the top bend of the valve stem will occur. In recent years, from the emergence of self-sealing valves, flange shut-off valve medium flow direction is changed from the valve flap above into the valve cavity, then in the medium pressure, off the valve force is small, and open the valve force is large, the diameter of the valve stem can be reduced accordingly. At the same time, under the action of the medium, this form of valve is also more tight. China's valve "three to" has been stipulated, the flow direction of the valve, always use the top-down. Ammonia globe valve open, the valve opening height, for the nominal diameter of 25% ~ 30%, the flow has reached max, said the valve has reached the full open position. So the full open position of the ammonia globe valve should be determined by the valve's stroke.
The structural forms of J41B ammonia globe valve body are straight-through type, straight flow type and right angle type. Straight-through type is Z common structure, but its fluid resistance. Straight flow type fluid resistance is small, mostly used for solid particles or viscosity of the fluid. Right-angle type valve body is mostly forged, suitable for smaller throughput, higher pressure of the globe valve. The center flange is square structure, and the valve stem is connected by inter-stem.
J41B ammonia globe valve main performance specifications: applicable media: liquid, gas, ammonia, nitrogen, hydrogen.
J41B flange ammonia globe valve structure features.
1, the center flange is a square structure, the stem is connected by the stem.
2, the valve body sealing surface part of the ball convex, and the foot of the valve to line anastomosis sealing.
3、The sealing surface is made of pasteurized alloy, which has good sealing performance and long service life.
I. Stainless steel ammonia disconnecting valve J41B main parts materials:
Part Name | Valve body, valve cover | seals | packing material | Packing Gland | tappet | gaskets |
J41B-25C | cast steel | pasteurized alloy | Polytetrafluoroethylene Vinyl | carbon steel | Polytetrafluoroethylene Vinyl | |
J41B-25Z | gray cast iron | |||||
J41B-25P | stainless steels | stainless steels | ||||
J41F-25Z | gray cast iron | carbon steel | ||||
Second, stainless steel ammonia disconnecting valve J41B performance specification:
Nominal pressurePN（MPA） | test pressurePS（MPa） | Applicable medium | Applicable temperature（℃） | |
2.5 | 3.8 | Ammonia, Ammonia liquid, etc.
| pasteurized alloy | graphite |
4.0 | 6.4 | |||
Third, stainless steel ammonia globe valve J41B main dimensions and weight:
Nominal diameter | Size（mm） | |||||||||||
L | D | D1 | D2 | D4 | b | f | f1 | Z-Φd | mountain pass | write out (a prescription, check, invoice etc) | D3 | |
10 | 130 | 90 | 60 | 40 | 35 | 16 | 2 | 4 | 4-Φ14 | 165 | 185 | 110 |
15 | 130 | 95 | 65 | 45 | 40 | 16 | 2 | 4 | 4-Φ14 | 165 | 185 | 110 |
20 | 150 | 105 | 75 | 55 | 51 | 18 | 2 | 4 | 4-Φ14 | 170 | 200 | 120 |
25 | 160 | 115 | 85 | 65 | 58 | 18 | 2 | 4 | 4-Φ14 | 197 | 210 | 120 |
32 | 180 | 135 | 100 | 78 | 66 | 20 | 2 | 4 | 4-Φ18 | 199 | 213 | 140 |
40 | 200 | 145 | 110 | 85 | 76 | 20 | 3 | 4 | 4-Φ18 | 248 | 264 | 160 |
50 | 230 | 160 | 125 | 100 | 88 | 22 | 3 | 4 | 4-Φ18 | 265 | 295 | 180 |
65 | 290 | 180 | 145 | 120 | 110 | 24 | 3 | 4 | 8-Φ18 | 310 | 349 | 220 |
80 | 310 | 195 | 160 | 135 | 121 | 26 | 3 | 4 | 8-Φ18 | 340 | 357 | 240 |
100 | 350 | 230 | 190 | 160 | 150 | 30 | 3 | 4.5 | 8-Φ23 | 380 | 413 | 280 |
125 | 400 | 270 | 220 | 188 | 176 | 32 | 3 | 4.5 | 8-Φ25 | 430 | 451 | 320 |
150 | 480 | 300 | 250 | 218 | 204 | 32 | 3 | 4.5 | 8-Φ25 | 505 | 492 | 360 |
200 | 600 | 360 | 310 | 278 | 260 | 34 | 3 | 4.5 | 12-Φ25 | 550 | 806 | 400 |
250 | 650 | 425 | 370 | 335 | 31 | 36 | 3 | 4.5 | 12-Φ30 | 730 | 880 | 450 |
300 | 750 | 485 | 430 | 390 | 364 | 40 | 3 | 4.5 | 16-Φ30 | - | 995 | 550 |
Stainless steel ammonia globe valve J41B operation and precautions
Stainless steel ammonia globe valve belongs to the forced sealing type valve, so when the valve is closed, pressure must be applied to the valve flap to force the sealing surface not to leak. When the medium enters the valve from below the valve flap, the resistance that the operating force needs to overcome is the friction of the valve stem and packing and the thrust generated by the pressure of the medium, the force to close the valve is greater than the force to open the valve, so the diameter of the valve stem should be large, or else the failure of the top bend of the valve stem will occur. In recent years, from the emergence of self-sealing valves, flange shut-off valve medium flow direction is changed from the valve flap above into the valve cavity, then in the medium pressure, off the valve force is small, and open the valve force is large, the diameter of the valve stem can be reduced accordingly. At the same time, under the action of the medium, this form of valve is also more tight. China's valve "three to" has been stipulated, the flow direction of the valve, always use the top-down. Ammonia globe valve open, the valve opening height, for the nominal diameter of 25% ~ 30%, the flow has reached max, said the valve has reached the full open position. So the full open position of the ammonia globe valve should be determined by the valve's stroke.
