HVAC Valves

American Wheatley HVAC Valves come in a variety of types and sizes. Each valve offers a back flow protection throughout its wide range of balancing settings. HVAC valve plugs have the ability to rotate to block the downstream port of the valves in order to allow pressure to equalize around the clappers, allowing the clappers to close with very little to no resistance.

Frequently Asked Questions

Commonly Inquired Questions About HVAC Valves

Memory Stop and Clapper Positive Check

memory stopclapper

Troubleshooting TSV/TDV Triple Duty Value
  1. Cannot get accurate gauge reading across TDV: 
    • To use as a balancing device, the valve must be at least 10 pipe diameters away from the pump. Take gauge readings across the pump instead of the TDV. The TDV must be closed at least 15% to obtain accurate  gauge readings. 
  2. Check Valve assembly has failed: 
    • TDV is probably too close to the pump, TDV should be 10 pipe diameters away from the pump discharge. At a minimum, 12" away for sizes up through 4", 24" away for sizes 5" and above. 
  3. Triple duty valve is making a chattering sound: 
    • The check valve assembly is chattering, close the TDV at least 15%. Chattering should stop. 
  4. Valve is making a clinking sound:
    • The spring in the check valve assembly may be broken, or some other particulate may be inside the TDV. Disassemble TDV and clean out any particulate, replace spring of necessary. 
  5. Valve is making whooshing sound:
    • Valve is either near fully open or fully closed position. The TDV must be closed at least 15% to operate properly, they are not intended for us fully open. The valve is close to fully closed, this is not recommended, if necessary install a smaller size TDV so that it is operating at mid-range of higher. Possibly the valve is too close to the pump and you're hearing turbulence, TDV should be 10 pipe diameters away from the pump discharge. At a minimum, 12" away for sizes up through 4", 24" away for size 5" and above. 
  6. Valve is making a whistling sound:
    • The valve is close to being closed, probably oversized. Replace with smaller valve so that operating point is at 50% open or higher.
  7. Loud Clapping noise when pump turns off:
    • The valve is operating properly, but water hammer is present, use of a water hammer arrestor or variable speeding pump can solve this problem. 
  8. The TDV setting moves after initial setting: 
    • Remove the handle. The handle should always be removed after settling of the TDV has been achieved. Memory stop tightened. Refer to Memory stop setting instructions. 
  9. TDV will not fully close:
    • Something is preventing valve from closing, disassemble valve and check to see if any foreign objects are inside valve body. Check valve assembly has failed, replace check valve assembly. 
  10. TDV will not fully open:
    • Something is preventing valve from opening, disassemble valve and check to see if any foreign objects are inside valve body. Check valve assembly has failed, replace check valve assembly. Excessive corrosion and scale build-up, valve may be able to be cleaned, or completely replaced.
  11. Valve will not turn at all:
    • Valve has not been operated throughout its range every 30 days as recommended. Scale and corrosion has frozen the components in place. Valve will need to be replaced if it cannot be broken free. 
  12. Check valve function not working, not holding back-pressure: 
    • Be sure check valve is properly installed with correct direction of flow, and not with the stem pointing down or sideways, the stem MUST be pointing upward.
    • The check valve has been damaged due to excessive chattering cause by turbulence, be sure TDV is far enough away from pump as previously described. Replace check valve assembly. 
    • Foreign debris may not be allowing check valve to properly seat. Disassemble TDV and remove debris. Clapper seal damaged by temperature extremes, -10F to 240F mac. Replace clapper seal. 
  13. Check valve function not working:
    • The TDV is NOT bi-directional, it must be installed in the proper orientation and direction of flow. Horizontal or vertical installation is acceptable as long as the stem is pointing upward or sideways, never install any valve with the stem pointing down. 
  14. TDV leaking from cover:
    • Cover bolts may be loose, tighten cover bolts. Cover o-ring damaged by temperature extreme, replace cover o-ring. Check chemical treatment. 
  15. TDV leaking around stem:
    • Stem o-ring damaged by temperature extreme, replace stem o-ring. Check chemical treatment. 
  16. TDV leaking at Schrader fitting:
    • Tighten fitting. Check thread sealant and apply additional sealant. Replace Schrader fitting. Check chemical treatment. 
  17. Schrader fitting leaks water when attaching meter hoses:
    • Schrader fitting is operating properly. 
  18. Leaking at flanged or threaded pipe connection:
    • Tighten flange bolts, replace flange gasket if necessary. Tighten threaded connection, check sealant. 

Triple Duty Valves Products