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API 594 Double Disc Butterfly Check Valve

  • Column:Check valve
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  • Updated:2018-01-19
Product Description
 Usages and structural features
Wafer double disc butterfly check valve is suitable for various pipelines of nominal pressure PN1.0MPa ~ 42.0MPa, CLASS150Lb ~ 2500Lb; Nominal diameter DN15mm ~ 1200mm, NPS1 / 2 "~ 48"; working temperature-196C ~ 540C. it is used to prevent medium backflow. Through the selection of different materials, the valve is applicable to water, steam, oil, nitric acid, strong oxidizing medium and urea and other media. The main features are:
1.the face to face dimension is short, is only 1/4-1/8 of the traditional flange check valve.
2.small size, light weight, the weight is only 1/4-1/20 of the traditional flange check valve
3.the disc closure is fast, the water hammer pressure is small
4.horizontal pipe and vertical pipe can both use the valve, and it is easy to install; 
5.the flow pipes are unobstructed, the flow resistance is small
6.Action is sensitive, and sealing performance is good;
7.the disc stroke is short, and the impact force is small 
8.the whole structure is simple and compact, with beautiful shape
9.Long service life with high reliability.
Standard and specifications
1.design and manufacture:AP1594.API6D.JB/T8937
2.face to face dimension:API594.API6D.DIN3202.JB/T8937;
3.pressure and temperature class:ANSI B 16.34.DIN2401.GB/T9124.HG20604.HG20605.SH3406.JB/T74
4.test and inspection:API598.JB/T9092
5.matched flange:JB/T74-90.GB/T9112-9124.HG20592-20635.SH3406.ANSIB16.5.DIN2543-2548.GB/T 13402. API605.ASMEB16.47.
 
Design Standard
Design and Manufacture Stand: API 594
End to End Dimension Standard: API6D
Flange End Dimension Standard: ANSI B16.5
Inspection and Test Standard: API 598
 
 
 

Material

Carbon Steel

Body

A216 WCB

Disc

A351 CF8

Spring

SS304

Pin

A182 F6

Retainer

A182 F6

Stainless Steel

Body

A351 CF8 CF8M CF3 CF3M

Disc

A351 CF8 CF8M CF3 CF3M

Spring

SS304

Pin

A182 304 316 F51

Retainer

A182 304 316 F51

Alloy Steel

Body

A217 WC1 WC6 WC9 C5 C12

Disc

A351 CF8

   

Spring

A182 F304

 

Pin

A182 F6

 

Retainer

A182 F6

Cast Iron

Body

GG25/GGG40

Disc

GGG40 CF8 CF8M

Spring

A182 F304

Ping

A182 410 416 420 431 304 316

Retainer

A182 410 416 420 431 304 316



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