This valve is used at a water pump's outlet to control the real working head of the pump so as to limit the working flow and the motor's load of it,make the pump working in a higher efficiency, prevent the motor from being overloaded in case if a low head,a big flow or a low efficiency and from being burnt due to an extra-rated cu r rent,with a certain energy saving effect Easy installation,maintenance,adjustment and check,long duration and of the function to be a slowly closed silencing check valve.
四、主要外形及連接尺寸 Schematic diagram of installation
公稱通徑 DN(mm)
20
25
32
40
50
65
80
100
125
150
200
250
300
350
400
450
500
600
700
800
L
180
180
180
203
203
216
241
292
330
356
495
622
698
787
914
978
978
1295
1448
1956
PN10
D
105
115
135
145
160
180
195
215
245
280
335
390
440
500
565
615
670
780
895
1010
D1
75
85
100
110
125
145
160
180
210
240
295
350
400
460
515
565
620
725
840
950
PN16
D
105
115
135
145
160
180
195
215
245
280
335
405
460
520
580
640
705
840
910
1020
D1
75
85
100
110
125
145
160
180
210
240
295
355
410
470
525
585
650
770
840
950
PN25
D
105
110
135
145
160
180
195
230
270
300
360
425
485
550
610
660
730
840
955
1070
D1
75
85
100
110
125
145
160
190
220
250
310
370
480
490
550
600
660
770
875
990
H
172
172
172
265
265
310
350
460
520
570
695
780
905
1025
1080
1030
1135
1270
1460
1640
H1
106
106
106
210
210
215
245
305
365
415
510
560
658
696
735
610
665
725
865
925
注:安裝示意圖中彈性座封閘閥或蝶閥任選,建議≥ DN350選蝶閥。
Note:Either elastic seat ring sealed gate valve or butterfly valve can be selected in the schematic diagram of installation Recomended to select the butterfly valve in case of ≥ DN350