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365betͶע / Liquefied petroleum gas special valve / A21F safety return valve Consulting Hotline: 021-331007323

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A21F safety return valve

A21F safety return valve
Stable quality: implement quality monitoring throughout the process, meticulous and comprehensive detection!

Reasonable price: efficient internal cost control, reducing expenses and benefiting customers!

Fast delivery: advanced production lines, sufficient stocking, shortening the delivery time!
Sales: 021-31007323
Fax: 021-333321522
Technology: 021-31007323

product manual Pledge Order process

  Product name :

A21F safety return valve

   Product model :


   Driving method :


   Connection form :


   Structure form :

Slightly open

   Sealing material :


   Pressure range :

MPa 1.6 ~ 4.0 MPa

   Nominal diameter :

-DN50 DN15 -DN50

   Common materials :

Cast steel, stainless steel

   Technical consultation :


是国内著名〖 A21F安全回流阀 〗制造商,也是国内大型【 液化气石油专用阀 】生产商之一,公司自成立以来始终围绕客户的需求并持续创新,为广大的代理商和企业客户提供〖 A21F安全回流阀 〗解决方案,质量可靠,价格实惠,故畅销全国各地,欢迎新老客户来电,来函,我们将为您提供最优质的服务。 Hushan Valve Manufacturing (Shanghai) Co., Ltd. is a well-known domestic manufacturer of [ A21F Safety Return Valve ] and one of the large domestic [ liquid gas petroleum special valve ] manufacturers. Since its establishment, the company has always focused on customer needs and continued innovation. The vast number of agents and corporate customers provide the A21F Safety Return Valve solution, which is reliable in quality and affordable, so it sells all over the country. Welcome new and old customers to call us and write us, we will provide you with the best service.

A21F safety return valve introduction

A21F safety return valve

Product overview of A21F safety return valve:
安装在管道上和贮罐、球罐上,保护设备内介质压力异常升高到规定值时。 A21F safety return valve is installed on pipelines and storage tanks, spherical tanks, when the medium pressure in the protection equipment abnormally rises to the specified value. 阀门 QDY42F hydraulic emergency cut-off valve
Automatically turned on, and then discharged in full, to protect the safety of equipment. Suitable for most pipelines.

Main design parameters of A21F safety return valve:
Design, manufacturing Flange connection Structure length Nominal diameter Nominal pressure
GB / T12243 JB / T79-94, GB9113-2000 GB12221-89 DN15 ~ DN50mm PN1.6, 2.5, 4.0MPa

3. Main performance parameters of A21F safety return valve:
Nominal pressure Shell test Seal test Opening pressure Applicable medium Suitable temperature
1.6 2.4 0.9PK User OK Liquefied gas, natural gas
Non-corrosive medium
-40 ~ + 80 ℃
2.5 3.75
4.0 4.4

Material of main parts of A21F safety return valve:
Body and bonnet Valve seat, disc, valve stem spring Sealing surface
WCB Chrome stainless steel Chrome vanadium steel Teflon

Five, the main dimensions of A21F safety return valve:
DN-JIS L h G D D1 do H
mm in
15 1/2 35 60 1/2 20 15 12 64
20 3/4 40 68 3/4 25 20 16 68
25 1 50 78 1 31 25 20 105
32 11/4 115 100 11/4 Inlet flange connection
Inlet of Flange
25 250
40 11/2 120 110 11/2 32 270
50 2 135 120 2 40 380

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