Overview of Primary Product

Advantages of balanced circuits
Balanced circuits have the following principal benefits:
1. In hydronic applications, the system emitters operate properly
saving energy and providing greater comfort.
2. In plumbing applications such as hot water recirculation, water is
not wasted when there is a call for hot water from a fixture.
3. Circuit pumps operate at maximum efficiency, reducing the risk of
overheating and excessive wear.
4. High fluid velocities which can result in noise, erosion and abrasion
are avoided.
5. The differential pressures acting on the circuit control valves are
reduced preventing faulty operation.
Operating principle
The 130 series balancing valve is a hydraulic device that controls
the flow rate of a fluid. Turning the knob moves a plug within
the fluid stream which varies the flow rate. The flow rate is
determined according to the pressure drop value measured by a
differential pressure meter connected to the pressure test ports.
Construction details
Venturi ow rate measurement device
As shown in the figure below, the 130 series balancing valve contains
two closely spaced pressure test ports located upstream of the valve
plug and at different cross sectional areas. As fluid flows through the
valve, the velocity at the port closest to the plug is greater than the
velocity at the port furthest. The result, referred to as the Venturi effect,
is an induced pressure differential across the ports.
Fast-coupling pressure test ports
The 130 series balancing valve has as standard probe type, fast-
coupling pressure test ports. The probe from the differential pressure
meter is inserted into the port packing, until the end of the probe
enters the system. When the measuring probe is pulled out, the test
port automatically closes, preventing fluid leakage. Care should be
taken to pull the probe out slowly so as to allow adequate time for
the packing to re-seal – otherwise fluid can quickly escape creating a
hazardous situation. Consult differential pressure meter manufacturer
instructions for proper use of instrument and pressure port couplings.
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Benefits:
1. Compared to variable orifice balancing valves, system balancing
can be quicker. In variable orifice balancing valves, one pressure test
port is located upstream and one downstream from the adjustment
plug, so as the valve is adjusted, the flow coefficient of the orifice
between the ports changes. Resultantly, to determine the flow rate,
an added step of visually estimating the orifice C
v
is required and
introduces a factor of interpretation error in the balancing process
leading to potentially less precise results.
Measuring
probe
Safety
cap
Seal
2. With variable orifice balancing valves, in low flow applications
requiring the valve to be closed more than 75% of full open,
downstream turbulence can cause an unstable pressure reading
signal which can result in measurement error. This effect is more
pronounced if fluid impurities are present. With the 130 balancing
valve with both ports upstream of the plug and away from turbulence
effects, there is better pressure signal stability and thus less chance
for pressure measurement error. There is also less sensitivity in the
presence of fluid impurities.
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