產品簡介：
緩閉式止回閥一般分為隔膜閥和活塞閥兩大類，本公司生產的緩閉式止回閥口徑在DN500mm以下者采用隔膜型，口徑在DN600mm以上者采用活塞型，兩者之動作原理類似。緩閉式止回閥具有開啟和關閉速度調控和逆止功能，閥門安裝能有效控制水泵在啟動與停止轉動時會自動調節到***開啟和關閉的速度。廣泛適用于工業給水、高層建筑由水泵直接給水系統中，有效減少水錘及水擊現象產生，達到安全關閉效果。
Products Introduction:
Dashpot check valves are usually divided into diaphragm valves and piston valves two categories, the caliber of the company’s production bellows DN500 using diaphragm type, and DN600 more in the use of piston type, whichever is the principle of similar moves. Dashpot check valve has the function of opening or cutting the speed control and pawl, it can control the water pump availably when the water pump is opening and stopping, the valve will regulate the speed of opening or closing automatically to the best state. It is widely used in the system whose water is supplied by the water pump, such as the industrial water supply、tall building water supply, effectively reduce the times of the water hammer and water beat, up to the safely effect of the closure.
主要零部件材質：Material of Main Parts:
序號Sequence Number | 部件名稱 Part Name | 材質Material |
1 | 閥體Body | 灰鑄鐵Cast Iron |
2 | 軸套Busing | 不銹鋼Stainless Steel |
3 | 閥座Seat | 青銅Bronze |
5 | 密封Seal | EPDM |
6 | 閥板Disc | 灰鑄鐵Cast Iron |
7 | 墊片Flake | EPDM with Nylon |
9 | 螺母Bonnet | 灰鑄鐵Cast Iron |
10 | 彈簧Spring | 不銹鋼 Stainless Steel |
11 | 轉軸 Stem | 不銹鋼 Stainless Steel |
主要性能參數Main Performance Parameters:
隔膜式：DN20-500
活塞式：DN600-800
公稱壓力Nominal Pressure PN（MPa） | 1.0 | 1.6 | 2.5 |
法蘭連接標準Flange Design Standard | GB/T 17241.6-1998 | GB/T9113.1-2000 |
殼體試驗壓力 Shell Testing Pressure（MPa） | 1.5 | 2.4 | 3.75 |
密封試驗壓力 Sealing Testing Pressure（MPa） | 1.1 | 1.76 | 2.75 |
***入口壓力 Max Pressure of Entrance（MPa） | 1.0 | 1.6 | 2.5 |
***動作壓力Min Pressure of Motion（MPa） | ≥0.07 |
工作溫度Working Temperature | 0℃~80℃ |
適用介質Suitable Mediums | 水Water |
主要外形尺寸和連接尺寸：Outline Dimensions & Connection Dimensions:
公稱通徑 Nominal Diameter DN (mm) | L | A | A1 | H | H1 | F |
20 | 180 | 282 | 200 | 172 | 106 | 116 |
25 | 180 | 282 | 200 | 172 | 106 | 116 |
32 | 180 | 282 | 200 | 172 | 106 | 116 |
40 | 240 | 320 | 210 | 265 | 210 | 170 |
50 | 240 | 320 | 210 | 265 | 210 | 170 |
65 | 250 | 330 | 215 | 310 | 215 | 180 |
80 | 285 | 350 | 220 | 350 | 245 | 210 |
100 | 360 | 410 | 230 | 460 | 305 | 275 |
125 | 400 | 420 | 245 | 520 | 365 | 310 |
150 | 455 | 430 | 260 | 570 | 415 | 355 |
200 | 585 | 440 | 280 | 695 | 510 | 460 |
250 | 650 | 450 | 300 | 780 | 560 | 500 |
300 | 800 | 460 | 320 | 905 | 658 | 580 |
350 | 860 | 470 | 340 | 1025 | 696 | 650 |
400 | 960 | 480 | 360 | 1080 | 735 | 715 |
450 | 970 | 530 | 395 | 1030 | 610 | 780 |
500 | 1075 | 580 | 420 | 1135 | 665 | 830 |
600 | 1230 | 600 | 445 | 1270 | 725 | 920 |
700 | 1650 | 730 | 495 | 1460 | 865 | 980 |
800 | 1750 | 830 | 530 | 1640 | 925 | 1050 |
