Self-acting differential pressure controllers with flow limiter - RCQoB

The self-acting differential pressure controllers with flow limiter are used in heating and industrial installations that are intended to adjust the differential pressure within the 0,2-1,6; 1-2,8 and 1-3,5 bar and set the flow rate in range 0,15-23 m³/h. That regulators are suitable to cold or hot water, (temperature up to 180°C for RCQoB regulators and up to 150°C for regulators RCQoBm) and non-flammable gases of temperature up to 80°C.

Key Features:

• High quality of regulation.
• Does not require conservation.
• Requiring no external power source.

Construction:

The self-acting differential pressure controllers with flow limiter are controled by the medium which flows through the valve. For ensuring stable regulation at high differential pressures, the valve-plug (4) is balanced (5). The regulator consisting of two units:
- the valve: valve body (1), flow limiter(2), valve-seat (3), valve-plug (4), balanced plug (5), valve-stem (6);
- the actuator: impulse pipe (7), actuator discs and diaphragm (8), springs (9), actuator-stem (10), adjusting nut (11), actuator-body (12).

Priciple of operation:

The medium enters to the valve chamber (A). The limiter-plug (2) determines size of the gap between the valve-chamber A and B. Higher pressure is transmitted through the impulse pipe (7) to the actuator chamber (C). Value of the pressure in the chamber (B) is transmitted by holes in valve-plug (4) to the chamber (D). Changes of pressure between the chamber B and pressure in the chamber C, creates a force which moves the valve-plug (4). When downstream pressusre overcomes the set point of the spring, the valve-plug (4) closes to moment when pressure between the chamber C and D will be equal to spring set point (9). The size of the regulated flow is controlled by adjustment of the limiter (2). The value of pressure difference is adjust by nut (11). During the selection of the desired range of settings should be remembered that it is the sum of pressure drop in a fully open the installation and measuring the pressure drop on the limiter.

Installation:

For ensuring good work the regulator should be protect by the filter or the magnetic strainer. Install on horizontally pipelines. The direction flow of medium have to correspond with the arrow on the valve body.

Technical data:

Series			RCQoB (flanged)
Diameter DN			15	20	25	32	40	50
Flow factor Kvs			3,2	5	8	12,5	20	32
Pressure PN			25 bar
Water flow m3/h for pressure drop	0,2	Qmin	0,15	0,2	0,4	0,6	1,0	1,6
		QMax.	1,3	2,0	3,2	5,0	8,0	13
	0,5	Qmin	0,3	0,5	0,8	1,2	2,0	3,0
		QMax.	2,3	3,5	5,6	8,8	14	23
Adjust range	Dm=240		-			0,2-1,6; 1-2,8 bar
	Dm=160		0,2-1,6; 1-3,5 bar			-
Max. pressure on the valve			12 bar
Max. temperature			180°C
Max. pressure in the actuator chamber			20 bar

flangeds connectors PN25, PN ISO 7005-1

Series			RCQoBm
Diameter DN			15	20	25
Flow factor Kvs			3,2	4,5	6,3
Pressure PN			16 bar
Water flow m3/h for pressure drop	0,2	Qmin	0,15	0,2	0,3
		QMax.	1,3	1,8	2,6
	0,5	Qmin	0,3	0,4	0,6
		QMax.	2,3	3,2	4,5
Adjust range Dm=160			0,2-1,6; 1-3,5 bar
Max. pressure on the valve			12 bar
Max. temperature			150°C
Max. pressure in the actuator chamber			16 bar

Dimensions [mm]:

Pressure regulator with flow limiter RCQoB flanged	Pressure regulator with flow limiter RCQoB screwed

DN	15	20	25	32	40	50
H1	76,5	82,5	82,5	94	102	110
H2	63	66	66	-	-	-
H1Max.	336	344	347	360	362	384
H2Max.	318	344	333	-	-	-
L1	130	150	160	180	200	230
L2	75	80	85	-	-	-

Value ranges:

Indicate value range	20	50	20	50
Adjust range Δ p [bar]	0,2	0,5	0,2	0,5
actuator series	Dm=160		Dm=240

Selection of self-acting differential pressure regulator with flow limiter