Bellows pressure reducing valve detailed description The bellows pressure reducing valve is mainly composed of bellows, adjusting spring, valve seat, valve disc and other parts. The direct acting bellows pressure reducing valve uses the bellows to sense the valve pressure to drive the valve disc, changing and Control the opening of the valve to realize the pressure reducing and stabilizing function. Set the outlet pressure by adjusting the adjusting screw.Main technical parameters of bellows pressure reducing valve
| Nominal pressure (MPa) | 0.6 | 1.0 | 1.6 |
| Shell test pressure (MPa) | 0.9 | 1.5 | 2.4 |
| Sealing test pressure (MPa) | 0.6 | 1.0 | 1.6 |
| Higher inlet pressure (MPa) | 0.6 | 1.0 | 1.6 |
| Outlet pressure range (MPa) | 0.05-0.4 | 0.1-0.8 | 0.1-1.0 |
| Pressure characteristic deviation (MPa) △P2P | GB12244-1989 | ||
| Flow characteristic deviation (MPa) △P2G | GB12244-1989 | ||
| Minimum pressure difference (MPa) | 0.1 | 0.15 | 0.15 |
| Leakage | GB12245-1989 | ||
The shell test does not include the bellows, and the bellows assembly must be removed for the shell pressure test.Materials of main parts of bellows pressure reducing valve
| Part Name | Part material |
| Valve body, bonnet | WCB |
| Bottom cover | WCB |
| Seat, Disc | 2Cr13 |
| Bellows | 1Cr18N9Ti |
| Bellows Upper Pad | 2Cr13 |
| Bellows under pad | 2Cr13 |
| Horn seat | 2Cr13 |
| main valve spring | 50CrVA |
| adjustment spring | 60S12Mn |
Bellows pressure reducing valve flow coefficient (Cv)
| DN | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 |
| Cv | 1 | 2.5 | 4 | 6.5 | 9 | 16 | 25 | 36 | 64 |
☆Y44H/Y bellows pressure reducing valve series connection size (PN0.6-1.6MPa)
| Nominal diameter DN | Dimensions | Connection size | ||||||||||||||||||
| L | h | H1 | PN1.6MPa | PN1.6MPa | PN1.6MPa | |||||||||||||||
| 0.6/1.0MPa | 1.6MPa | D. | K | n-Φ | d | C | D. | K | n-Φ | d | C | D. | K | n-Φ | d | C | ||||
| 15 | 140 | 140 | 290 | 90 | 80 | 55 | 4-12 | 40 | 12 | 95 | 65 | 4-14 | 45 | 12 | 95 | 65 | 4-14 | 45 | 14 | |
| 20 | 140 | 140 | 295 | 98 | 90 | 65 | 4-12 | 50 | 12 | 105 | 75 | 4-14 | 55 | 14 | 105 | 75 | 4-14 | 55 | 14 | |
| 25 | 160 | 160 | 295 | 110 | 100 | 75 | 4-12 | 60 | 14 | 115 | 85 | 4-14 | 65 | 14 | 115 | 85 | 4-14 | 65 | 14 | |
| 32 | 1080 | 180 | 295 | 110 | 120 | 90 | 4-14 | 70 | 14 | 135 | 100 | 4-18 | 78 | 16 | 135 | 100 | 4-18 | 78 | 16 | |
| 40 | 200 | 200 | 325 | 125 | 130 | 100 | 4-14 | 80 | 14 | 145 | 110 | 4-18 | 85 | 16 | 145 | 110 | 4-18 | 85 | 16 | |
| 50 | 230 | 230 | 325 | 125 | 150 | 110 | 4-14 | 90 | 14 | 160 | 125 | 4-18 | 100 | 16 | 160 | 125 | 4-18 | 100 | 16 | |
| 65 | 280 | 325 | 130 | 160 | 130 | 4-14 | 110 | 14 | 180 | 145 | 4-18 | 120 | 18 | 180 | 145 | 4-18 | 120 | 18 | ||
| 80 | 310 | 380 | 160 | 185 | 150 | 4-18 | 125 | 16 | 195 | 160 | 4-18 | 135 | 18 | 195 | 160 | 8-18 | 135 | 20 | ||
| 100 | 350 | 380 | 170 | 205 | 170 | 4-18 | 145 | 16 | 215 | 180 | 8-18 | 155 | 20 | 215 | 180 | 8-18 | 155 | 20 | ||
