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 ℃ .

Threaded safety relief valve

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:

spring loaded low lift threaded safety relief valve(A21)
spring loaded low lift threaded safety relief valve with lever(A27）
spring loaded Full lift threaded safety relief valve with lever(A28）

In order to offer a quotation,we need specifications as following:

Thread standard:BSPT/NPT
Pressure Rating
Size
Set Pressure
Material for Body&Trim (Material for inside parts).
Operation type: With lever or not
Medium
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

For more details, please download catalogue for reference or contact with us.

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