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Pressure Independent Balancing Control Valves

“RC” make pressure independent balancing control valves (PIBCV) is designed, tested and manufactured in-house with features and uses mentioned below.

“RC” pressure independent balancing control valves (PIBCV) are designed, tested, and manufactured in-house to ensure exceptional performance and reliability. These valves combine flow regulation and pressure balancing in a single unit, offering the following key features and applications

Use

Mostly used in Air conditioning systems such as F.C.U., A.H.U. and zones for controlling the right amount of flow required for heating and cooling application the pressure deferential can be checked by inlet outlet test point.

Features

Dynamic self balancing design
Upto 1800 LPH flow design
Pressure differential range 20
600 kPa-Snap acting and modulating control type
Test points for measuring pressure differential

Principal

The media enters from inlet port(6) then it flow through variable presetting opening(9) which is connected to dial for presetting(10) then it flow through dynamic balancing seat(7) then it flow through ON/OFF seat(4) which is connected to valve stem(3).
In case of change in pressure differential the diaphragm(8) expands or contracts, which open or close dynamic balancing seat (7), thus automatically/dynamically balancing the change in pressure differential.
In case, of pre-setting, the measurement of the differential pressure across can be checked by electronic manometer and adjustment can be made by dial for pre-setting(10).
The actuator would be installed for ON/OFF operation, the actuator is connected with valve stem(3),which is connected to valve ON/OFF seat (3) and actuator open or close the valve seat.
In case, operation W/o actuator. manual knob can be used to control valve stem(3) which is connected to valve ON/OFF seat(4)

Calculation

Formula for Calculating Volume of Flow

V_LPH = (Q × 1000) / (1.163 × ΔT)

Where:
Q = Energy demand in kW
ΔT = Temperature differential in Kelvin (K)

Example:

Q = 2.3 kW
ΔT = 8 K
V_LPH = (2.3 × 1000) / (1.163 × 8) = 247.2056 LPH

Suggestion:
Add 10% extra while selecting valve size (valve performance is best at 90% output).

Tables

Valve size volumetric flow chart with dial for pre-setting(10) valves

DIAL	15MM (LPH)	15MM (Kpa)	20MM (LPH)	20MM (Kpa)	25MM (LPH)	25MM (Kpa)
1.0	500	27	500	35	850	30
1.2	573	27	586	35	971	30
1.4	636	27	669	35	1089	30
1.6	692	27	749	35	1198	30
1.8	746	27	826	35	1296	30
2.0	800	27	900	35	1380	30
2.2	855	27	971	35	1450	30
2.4	913	27	1040	35	1505	30
2.6	974	27	1106	35	1546	30
2.8	1037	27	1169	35	1577	30
3.0	1100	27	1230	35	1600	30
3.2	1161	27	1288	35	1640	30
3.4	1216	27	1344	35	1680	30
3.6	1261	28	1398	35	1720	31
3.8	1291	28	1450	35	1760	31
4.0	1300	28	1500	35	1800	31

NOTE:- Estimated data based on volumetric flow

Working pressure – 25 kg/cm²

Shell leakage test – 32 kg/cm²

Valve type – ON/OFF type

Working type – NO type (push to close)

Valve body – Brass as per IS:8737

Valve stem – S.S.304

Valve seat – Brass as per IS:319 grade DCB-I

All springs – S.S.304

Diaphragm – N.B.R.

Piston – Brass as per IS:319 grade DCB-I

Pre-setting knob (MOC) – ABS plastic

Variable pre-setting – Brass as per IS:319 grade DCB-I

Linear Electric Actuators