Danfoss CHV-140B 15-100 Check Valve
Installation Instructions
Refrigerants
Applicable to R744(CO2). The valve is only recommended for use in closed circuits. For further information please contact Danfoss.
- Temperature range -40/+150 °C (-40/+302 °F)
- Pressure range 140 bar (2030 psi)
The valve must be installed with the top part vertically upwards, DN 15-40 are acceptable for horizontal installation only if the vertical installation does not match the piping (fig.1). The valve is designed to withstand a high internal pressure. However, the piping system should be designed to avoid liquid traps and reduce the risk of hydraulic pressure caused by thermal expansion. It must be ensured that the valve is protected from pressure transients like “liquid hammer” in the system.
Flow direction
Direct the flow towards the cone as indicated by an arrow on the valve housing (fig. 1).
Welding
The complete top part should be removed before welding (fig. 2) to prevent damage to the O-ring in the insert and the gasket between the valve body and top part as well as the teflon in the valve cone. Be careful not to damage the teflon cone ring and make sure the complete top part is protected from dirt and water while removed. Only materials and welding methods, compatible with the valve housing material, must be applied to the valve housing. The valve housing must be free from stresses(external loads) after installation. The valve should be cleaned internally to remove welding debris on completion of welding and before the valve is reassembled.
Brazing
When brazing the housings with SD(DIN) and SA(ASME) connections (fig. 3), follow the steps as follows,
- Remove the complete top part
- Clean connections with cleaning agent
- Wrap around wet cloth
Assembly
Remove welding debris and any dirt from pipes and valve body before assembly.
Tightening
Tighten the top part with a torque wrench, to the values indicated in the table (fig. 4). Please note that the table (fig. 4) containing maximum torque must be adhered to and never exceeded.
Important for CHV-140B 50 – 100 valves: For optimal flow the insert must be installed as indicated in (fig. 7). Otherwise kv value will be below indicated in the technical brochure.
Colours and identification
The CHV-140B valves are painted with a green primer(except housing with SA/SD connections) in the factory. Precise identification of the valve is made via the ID ring/name plate at the top of the top part as well as by the stamping on the valve body. The external surface of the valve must be protected against corrosion with a suitable protective coating after installation and assembly. Protection of the ID-ring/name plate when repainting the valve is recommended.
Maintenance
Dismantling the valve (fig. 5a/5b)
Do not remove the complete top part while the valve is still under pressure.
DN 15-40 (fig. 5a)
- Check that the O-ring (pos. A) and gasket (pos. B) have not been damaged.
- The EPDM O-ring (pos. A) can be replaced using Danfoss spare parts. This may be needed every second year, when operating constantly close to the +150 °C temperature limit.
- If the teflon cone ring (pos.C) has been damaged, the whole cone assembly (included in the repair kit) must be replaced.
DN 50-100 (fig. 5b)
- Check that the spring (pos. A) is intact.
- Check that the O-ring (pos. B) and gasket (pos. C) have not been damaged.
- The EPDM O-ring (pos. B) can be replaced using Danfoss spare parts. This may be needed every second year, when operating constantly close to the +150 °C temperature limit.
- If the teflon cone ring (pos. D) has been damaged, the whole cone assembly (included in the repair kit) must be replaced.
Replacement of the cone (g. 6)
DN 15-40
Unscrew the lower part of the insert and pull the cone assembly out. Ensure that the spring is not lost in the process. Remove dirt, if any. Mount new cone assembly and the spring. Screw in the lower part of the insert and tighten it (fig.8).
Assembly
Remove dirt, if any, from pipes and housing before assembly.
Note:
For CHV-140B sizes DN 15-40 it is important to ensure that the lower and upper part of the insert is tightly screwed together (fig. 8) and that this screw connection is kept tight during repositioning of the cone in the housing.
Tightening
Tighten the top part with a torque wrench,to the values indicated in the table (fig. 4). Use only original Danfoss parts for replacement. Materials of new parts are certified for the relevant refrigerant. In cases of doubt, please contact your local Danfoss sales office.
Any information, including, but not limited to information on selection of product, its application or use, product design, weight, dimensions, capacity or any other technical data in product manuals catalogues descriptions, advertisements, etc. and whether made available in writing, orally, electronically, online or via download, shall be considered informative, and is only binding if and to the extent, explicit reference is made in a quotation or order confirmation. Danfoss cannot accept any responsibility for possible errors in catalogues, brochures, videos and other materia Danfoss reserves the right to alter its products without notice. This also applies to products ordered but not delivered provided that such alterations can be made without changes to form, fit or function of the product. All trademarks in this material are property of Danfoss A/S or Danfoss group companies. Danfoss and the Danfoss logo are trademarks of Danfoss A/S. All rights reserved.
Danfoss A/S
Climate Solutions
danfoss.com
+45 7488 2222
Documents / Resources
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Danfoss CHV-140B 15-100 Check Valve [pdf] Installation Guide CHV-140B 15-100, 148R9679, CHV-140B 15-100 Check Valve, CHV-140B 15-100, Check Valve, Valve |
