透明UPVC安全背壓閥介紹：
|
規(guī)格
|
L
|
H
|
D
|
d
|
z
|
h
|
|
DN15
|
175
|
181
|
82
|
20
|
22
|
27
|
|
DN20
|
174
|
181
|
82
|
25
|
19
|
29
|
|
DN25
|
202
|
198
|
107
|
32
|
21
|
33
|
|
DN32
|
251
|
198
|
107
|
40
|
31
|
35
|
|
DN40
|
285
|
260
|
155
|
50
|
31
|
60
|
|
DN50
|
355
|
260
|
155
|
63
|
39
|
60
|
|
DN65
|
376
|
260
|
155
|
75
|
41
|
65
|
