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Safety relief valve

Threaded Safety Relief Valve

A21 type thread safety relief valve are used for the equipment and pipelines with such medium air,ammonia and petroleum at a working temperature less than 200 ℃ .A27 type Thread safety relief valve are used for the equipment and pipelines such media as water,air and steam at a working temperature less than 200 ℃ .A28 type thread safety relief valve are used for the equipment and pipelines with such medium as of air,vapour,water and N2-H2 mixed gas at a working temperature less than 200 ℃ .

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Description

A21 type thread safety relief valve are used for the equipment and pipelines with such medium air,ammonia and petroleum at a working temperature less than 200 ℃ .A27 type Thread safety relief valve are used for the equipment and pipelines such media as water,air and steam at a working temperature less than 200 ℃ .A28 type thread safety relief valve are used for the equipment and pipelines with such medium as of air,vapour,water and N2-H2 mixed gas at a working temperature less than 200 ℃ .


Features:
safety valve/pressure relief valve, angle type                                 
low lift, metal to metal seated/soft seal
threaded connection end

Applications:
Provided as safety device for protection against 
excessive pressure in pressure vessels
Approved for gases and fluids
Working temperatures: ≤ 200℃

Standards Compliance:
Design and Manufacture: API RP 520
Face to Face(end to end): API 526
Test and Inspection: API 527

Model/Types:
1.spring loaded low lift  threaded safety relief valve(A21)
2.spring loaded low lift  threaded safety relief valve with lever(A27)
3.spring loaded Full lift threaded safety relief valve with lever(A28)

In order to offer a quotation,we need specifications as following:
1.Thread standard:BSPT/NPT
2.Pressure Rating
3.Size
4.Set Pressure
5.Material for Body&Trim (Material for inside parts).
6.Operation type: With lever or not 
7.Medium
8.Working Temperature

Material for main parts  

NO Name of part Material Material Materials
1 Union 20 304 316
2 Union nut 35 2Cr13 304
3 Nozzle 35 304 316
4 Body WCB 304 316
5 Disc 2Cr13/PTFE 304/PTFE 316
6 Spring Washer 2Cr13 304 316
7 Spring 50CrVA 50CrVA coated teflon 50CrVA coated teflon
8 Locking Nut Q235-A 2Cr13 304
9 Spring guide 2Cr13 304 316
10 Adjust nut Q235-A 2Cr13 316
Sealing surface of material "H" depositing D507, "W" same as body, "Y" depositing stellite, "F" PTFE soft seal


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