一、結構及用途 structure and purpose
該閥用于水泵出口控制水泵的實際工作揚程 ,以限制水泵的工作流量,限制水泵電機負載,使水泵在較高效率狀態下工作,防止水泵電機在低揚程、大流量、低效率時發生過載現象，防止超額定電流燒壞水泵電機現象發生，同時起到一定節能效果。安裝、維護、調試、檢查方便，使用壽命長，同時具有緩閉清聲止回閥功能。
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。
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