Does a circulator pump need a check valve?

Whenever a zone connects to the main piping in the recirculation system, a check valve is required. A proper design will have a flow control valve installed at the end of the zone to regulate how much water goes through that zone.

Does the Grundfos pump have a check valve?





Grundfos Pump, Circulator 115V 1/25 HP w/ Integrated Check Valve Bronze The Grundfos UP1510BUC7 (59896241) is a bronze circulator pump with a 3/4″ sweat inlet and a 3/4″ sweat union outlet along with a removable integral check valve.

Does a recirculating pump need a return line?

Domestic Hot Water Recirculation Part 5: Recirculation WITHOUT a Return Line. Not every domestic hot water recirculation system requires a return line. For residential and light commercial applications, there is another way to save water and maintain hot water at the last fixture.

How does the Grundfos Comfort valve work?

Quote from the video:
Quote from Youtube video: The Grundfos comfort system provides the ultimate convenience. As hot water is instantly available at showers sinks. And appliances throughout the household in addition to the comfort.

Can water flow through a pump that is off?

Regarding the positive flow through the pump that is shut off – water can still flow through the open spaces around the pump’s impeller.

Why is my recirculating pump not working?





Circulator pumps can stop working for several reasons: a blown fuse, bad wiring or a dead motor. Troubleshooting the possible causes in a systematic manner ensures you can find the reason your circulator pump isn’t working so you can get it back up and running as soon as possible.

Where is the non-return valve on a pressure pump?

The valve could be a source of a transient flow leading perhaps to severe pressure waves, NRV should be installed directly downstream of the pump in order to protect the pump from any damage due to the consequences of any generated surge pressures.

What is the difference between non-return valve and check valve?

A non-return valve lets the fluid flow in one direction. When fluid in the line reverses direction, a check valve prevents backflow by allowing flow in one direction. The check valves are usually designed for a particular pressure.

What does a non-return valve do?

A non-return valve allows a medium to flow in only one direction and is fitted to ensure that the medium flows through a pipe in the right direction, where pressure conditions may otherwise cause reversed flow.

How does the Grundfos bypass valve work?



Quote from the video:
Quote from Youtube video: When it begins to cool the pump activates the valve opens. And water is pushed back to the water heater through the cold water line until the hot water line is back up to temperature.

How do you test a Grundfos circulation pump?

These steps are for Lowara and Grundfos pumps, but will generally apply to all central heating pumps.

  1. Step 1: Find the Pump. …
  2. Step 2: Visibly inspect the pump for damage. …
  3. Step 3: Turn off the power supply. …
  4. Step 4: Loosen the silver plate. …
  5. Step 5: Remove the silver plate. …
  6. Step 6: Check if the pump shaft has seized.

How does a thermal bypass valve work?

These self-actuating thermal bypass valves monitor inlet flow and automatically divert the fluid based on temperature to one of two outlet ports. Fluid below the valve’s set-point temperature is bypassed to a reservoir or bypass loop while fluid at or above the set-point is diverted to the system’s cooler.

What is a thermal bypass?



Thermal bypass is heat transfer that bypasses the conductive or conductive-radiative heat transfer between two regions. Defined in this manner convective loops, which include both air infiltration and windwashing.

What is a thermal valve?

A Thermal Valve is used to eliminate heat build-up in a closed loop by-pass system when liquid is being returned to the pump inlet. Thermal Valves can only be installed when there is a pressurized pump inlet. During recirculation of by-pass liquid, the thermal valve will detect temperature rises in the liquid.