Dual Wafer Check Valves,Retainless Type
Product Description
Product description |
Double-clack check valve |
Model |
Hn76H-double-clack check valve |
Nominal diameter |
NPS 2”~60”(DN50~DN1500) |
Operating temperature |
-29℃~593℃(the range of service temperature may vary for different materials) |
Nominal pressure |
CLASS 150~2500 (PN20~PN420) |
Material |
Main material: A890 4A(CD3MN)、A216 WCB、WCC; A217 WC6、WC9 ;B 148 C95800、C95500, A351 CF8、CF8M、CF3、CF3M,etc. |
Design standard |
API 6D、API 594、ASME B16.34 |
Structural length |
API 6D、API 594 |
Connecting end |
ASME B16.47、ASME B16.5 |
Test standard |
API 598、ISO 5208 |
Operation method |
The valve clack is automatically opened and closed under the medium force to prevent flowing to another direction. |
Application fields |
For application fileds- petroleum refining, petrochemical engineering ,electric power industry , offshore oil, chemical engineering, etc. |
Other remarks 1 |
Short closing travel of valve clack, and small impact at valve closing; short structural length, most suitable for positions with limited mounting space |
Other remarks 2 |
Due to loading of spring, the valve clack can move flexibly without jamming, and has a good sealing performance. |
Other remarks 3 |
Suitable for medium backflow prevention in pipeline or device |
Other remarks 4 |
Built-in pin roll, without external leakage point |
Available retainer type and retainerless type
Testing is available including
All bodies and plates certified to EN 10204 3.1 as a minimum
Surface finish to MSS SP-55 on cast components
All valves are hydrostatically tested as per API 598
Hydrostatic pressure testing up to 15,000psig
Tensile/Bend/Impact/Hardness testing
Magnetic particle test
Dye Penetrant test
Ultrasonic examination
Chemical analysis
Positive material identification(PMI)
Ferrite content verification