一、Structures Characteristics And Usahe
This valve uses butt-installation and is used in the pipeline or at the pump outlet to，as a safety device．prevent the pump from inversed running due to the differential water hammer’s shock caused by the medium Js back。flow in the pipeline when the pump stops，and features small volume，light weight，easy in-stallation and maintenance，set with a guide device，flexible and quick close，preventing huge medium’back—flow differential and forming silencing effect．
Suitable for the pipeline of water supply and drainage，fire-fighting，warming etc．or the pump outlet to prevent both pump and pipline from being damaged due to the medium’s back-flow water hammer’shock
二、 Maind Technique Number
| Type |
Nominal PN(MPa) |
Test stre-ngth pressure (MPa) |
Test seal pressure
(MPa) |
Applicable
temperatre (℃) |
Applicable media |
| H76X-10 H77X-10 |
1.0 |
1.5 |
1.1 |
≤80 |
Clean-water
Slops
Sea |
| H76X-16 H77X-16 |
1.6 |
2.4 |
1.76 |
三、 Material For Main Parts
| Name of part |
Body |
Disc |
Stem |
Spring |
Seat |
| Material |
Cl、
Bowl-shaped steel、
Stainless steel |
Cl、 Bowl．shaped steel、
Stainless steel |
Stainless steel |
Stainless steel |
NBR Stainless steel |
四、 Main Extermal Dimensions
| Nominal diameter DN(mm) |
L |
H |
D |
| 1.0MPa |
1.6MPa |
| 50 |
43 |
60 |
105 |
105 |
| 65 |
46 |
73 |
124 |
124 |
| 80 |
64 |
89 |
142 |
142 |
| 100 |
64 |
110 |
162 |
162 |
| 125 |
70 |
141 |
192 |
192 |
| 150 |
76 |
168 |
218 |
218 |
| 200 |
89 |
219 |
272 |
273 |
| 250 |
114 |
273 |
328 |
328 |
| 300 |
114 |
324 |
378 |
384 |
| 350 |
127 |
356 |
438 |
444 |
| 400 |
140 |
418 |
489 |
495 |
| 450 |
152 |
457 |
540 |
555 |
| 500 |
152 |
526 |
594 |
616 |
| 600 |
178 |
626 |
695 |
734 |
| 700 |
229 |
672 |
810 |
804 |
| 800 |
241 |
778 |
916 |
910 |
| 900 |
241 |
878 |
1016 |
1010 |
| 1000 |
300 |
914 |
1124 |
1128 |
|
