Stainless Steel High Velocity Relief Valve
1. Application
The stainless steel high-velocity relief valve generally used in the relief system of the oil tanker and chemical tanker according to the current regulations: IMO and IBC. The purpose of the high velocity valve is to provide automatic control of pressure differentials during liquid cargo ship loading, voyage, ballasting and de-ballasting without any manual operation, also, it provides auto-protection against fire and explosions on desk.
2. Material
valve body: cast steel
valve seat: stainless steel 0Cr18Ni9 SUS304
flame screen:stainless steel 00Cr17Ni14Mo2 SU316L
Remarks：The materials mentioned before are basic materials, ship-owners can choose better materials, such as SUS304, SUS304L, SUS316L.
3. Nominal Size & Pressure
diameter：DN50—DN250
pressure: (1) oil tanker: -3.5Kpa to 14Kpa;
(2) chemical tanker: -3.5Kpa to 20Kpa.
4. Features
(1). Adjustable outside opening and closing pressure without exhausting vapor gas.
(2). Full lifting and high flow capacity.
(3). Clearly visible vacuum disc operation.
5. Specification(mm)
Serial No.
DN
D2
D1
D
L
H
Flange Hole
1
50
90
110
140
255
485
4xφ14
2
65
110
130
160
255
485
4xφ14
3
80
128
150
190
285
535
4xφ18
4
100
148
170
210
285
565
4xφ18
5
125
178
200
240
380
665
8xφ18
6
150
202
225
265
385
710
8xφ18
7
200
268
295
340
455
850
8xφ18
8
250
320
350
395
460
860
12xφ22
6. IACS Certificate: RINA, ABS, BV,CCS,LR
7. Stainless Steel High Velocity Relief Valve in factory:
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