Where should a balancing valve be placed?

Shifting viewpoints on flow controls can cause disagreements where balancing valves should be located in closed loop systems. Many (including us at Hays Fluid Controls) agree that the balancing valves should be placed on the return side, whereas other companies may choose the supply side.

Does DRV go on on the flow or return?

Double regulating valves (DRV) For flow regulation only. Typically this valve is a Y pattern globe valve arranged in this way to present the smallest pressure loss to the system when fully open. Adjustment of this valve will add resistance to the system and hence reduce the flow.

What is DRV valve in HVAC?

Double regulating valves are pressure sensitive and they react to pressure changes from the hot and cold water flowing into them. It causes the valve to either open or closes a port, thus maintains a pressure balance.

Does a balancing valve go on the supply or return?

Most agree (including those of us at JMP) that flow balancing valves should be placed on the return side of coils whenever possible. Compared with placement on the supply side, flow balance valves on the return side will reduce the amount of free air in the coil and thus the potential for noise.

What is fixed orifice double regulating valve?

Economy Fixed Orifice Bronze Double Regulating Valve. This low cost screwed bronze balancing valve with fixed orifice, is designed for auto balancing applications of heating and cooling systems. It can be used safely in all pressure heating, cooling and potable water installations up to 25bar.

What does a commissioning set do?

A DPCV is set to maintain a steady differential pressure under dynamic balancing conditions, ensuring flow cannot exceed a desired rate. It therefore helps reduce both energy consumption and the risk of noisy vibrating pipes, while also allowing commissioning to focus on one circuit at a time.

Where are double regulating valves used?

The Double Regulating feature allows the valve to be used for isolation and to be reopened to its pre-set position to maintain required flow rate; and regulation. Primarily used in a ring main piping circuit requiring double regulating valves for the system balancing and commissioning of heating systems.

How do you measure a balancing valve?

Instructions: Step 1: Select the specifics of the valve to be tested (i.e. valve type and size). Step 2: Select the presetting value as read off the handwheel indicator. Step 3: Measure the pressure drop across the valve and enter it in the box below….Flow Rate.

How does a balancing valve work?

Dynamic balancing valves work as flow limiters. They are set to a desired flow rate and ensure that a larger flow rate does not take place. If the pressure in front of the valve increases, it will close some more, so the pressure loss across the valve becomes correspondingly higher.

What are the different types of balancing valves available in Cimberio?

Cimberio has four models to choose from: Cim 747.1 Fixed Orifice Balancing Valve, Cim 787.1 Variable Orifice Balancing Valve, the Cim 788.1 Actuated Balancing Valve – available Spring 2011, and the Cim 790.1 Automatic Balancing Valve. For more information, check our sell sheet.

How is the flow rate of a balancing valve read?

The flow rate is directly read by the balancing technician. This type of valve is generally more expensive than traditional manual balancing valves, but can simplify balancing, reduce balancing labor time significantly and eliminate errors. Figure 6 shows an example.

What is a manual balancing valve?

Manual (also known as pressure-dependent or static) balancing valves have been the industry workhorses for decades. They are called “static” balancing valves because once they are adjusted, there is no movement of the internal components.

How does a thermostatic balancing valve work?

In a TBV, an internal thermostatic balancing cartridge expands and contracts in response to water temperature passing through the valve. When cool water is present, the valve plug is fully open to maximize flow. As water temperature rises, the valve begins to close down until the temperature reaches the user-set value.