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COOSAI VALVE >> Products >> Valve series >> Safety relief valve

Safety relief valve

Safety valve as the best device for extra-pressure protection, will automatically open and fully discharge to protect the equipment pressure form going on rise when an equipment pressure lowers to the setting valve.
Safety valve cover is enclosed is order to protect dust and foreign matters from getting in and protect toxic and combustible media form over-flow. While the opened cover of the open-type safety valve, which benefits to lower the temperature inside of the spring chamber is mainly used for the pipeline and container with steam medium and the safety valve with aheat-scatterer is suitable for the medium with a tempera-ture over 350℃
For the safety valve with a wrench, it can be opened manually with the wrench when the medium’s pressure is up to over 75% of that at which the valve opens.
Fully-opened safety valve’s height of opening ≥the diameter of the flow path with a large amount of discharge, the height of opening for a micro-open safety valve the diameter of the flow path.

Safety relief valve
Safety relief valve

Safety relief valve / Performance

The allowable tolerance of the set pressure: = ±3%
Overpressure: = 10%
Blow down: = 10%
Tightness: the valves have good seat tightness, conforms for API 527

Technical specification

Design reference API RP520
Structural length API 526
Flanged ends ASME B16.5a
Test &inspection API527

Note: The dimension of connecting flange can be designed according to customers’ requirements.



Materials of major parts

No. accessory name Sign of Materials
C C6 S SM SL Mc M H
1 Body WCB WC6 CF8 CF8M CF3M WCB Monel Hast.C
2 Seat 304/316 304/316 316 316L 316L Monel Monel Hast.C
3 Adjust ring CF8 CF8 CF8M CF8M CF3M CF8M Monel Hast.C
4 Valve Clack 304 304 316 316L 316L 630 Monel Hast.C
5 Valve Clack Holder 420 420 630 630 316L 316L Monel Hast.C
6 Guide 304 304 304 316 316L 316 Monel Hast.C
7 Spring Seat WCB WCB 420 420 420 420 420 420
8 Spring 50CrVA
9 Stem 420
10 Bonnet WCB WC6 CF8 CF8M CF3M WCB Monel Hast.C
11 Bellows 316L Monel Hast.C

Note: Major parts of the valve series and materials of sealing surface differ according to casual working condition and customers' special requirements.