DIN 900 Series Spring Loaded Safety Relief Valve
DIN 900 Series Spring Loaded Safety Relief Valve
DIN Standard Safety Valve Features:
Safety valves were first used on steam boilers during the industrial revolution. Early boilers without them were prone to accidental Explosion.
The two general types of protection encountered in industry are thermal protection and flow protection.
For liquid-packed vessels, thermal relief valves are generally characterized by the relatively small size of the safety valve necessary to provide protection from excess pressure caused by thermal expansion. In this case a small valve is adequate because most liquids are nearly incompressible, and so a relatively small amount of fluid discharged through the relief valve will produce a substantial reduction in pressure.
DIN Standard Safety Valve Specification
Type
Nominal Pressure
Body Material
Nominal Diameter
Working Temp.
901/902/911/912
PN40/16
1.0619+N
DN20/32-DN150/250
-10C～450C
901/911
PN40/16
1.4408
DN20/32-DN100/150
-60C～400C
DN
20/32
25/40
32/50
40/65
50/80
65/100
80/125
100/150
120/200/
150/250
Throat Diameter do
(mm)
18
22
29
36
45
58
72
80
100
125
Orifice Area Ao(mm)
254
398
661
1018
1590
2688
4072
6362
8825
12266
Weight (Kg)
8.5
10
14
20
28
40
53
80
125
165
Safety Valve (Pressure Relief Valve) Dimension
901, 902, 911, 912 Type Safety Valve
DN×DN1
20/32
25/40
32/50
40/65
50/80
65/100
80/125
100/150
120/200/
150/250
D
PN16
105
115
140
150
165
185
200
220
250
285
PN40
235
220
300
K
PN16
75
85
100
110
125
145
160
180
210
240
PN40
190
220
250
B
20
20
20
21
22
24
26
28
31
34
D1
PN16
140
150
165
185
200
220
250
285
340
405
K1
100
110
125
145
160
180
210
240
295
355
B1
19
19
20
20
20
20
22
22
27
29
L
85
100
110
115
120
140
160
180
200
220
L1
95
105
115
140
150
170
195
220
250
285
≈H
298
311
315
355
405
555
580
690
845
890
Vent(with plug)
G3/8”
G1/2”
Safety valves also evolved to protect equipment such as pressure vessel (fired or not) and heat exchangers. Safety valve term should be limited to compressible fluid application (gas, vapor, steam).
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