Self-acting flow controller - RQB

Self-acting flow controllers type RQB are intended to maintain a compensated constant flow rate to limit the flow downstream in range 0,15-23 m³/h. They are suitable to cold water, hot water (up to temperature of 180° C for controllers and RCB type and up to 150° C for controllers type RQBm) and non-flammable gases up to 80° C.

Key Features:

• Installation on the supply or return pipe lines.
• High quality of regulation.
• Does not require conservation.
• Requiring no external power source.

Construction:

For ensuring stable regulation at high differential pressures, the valve-plug (4) is balanced (5). The controller is composed from two connected components:
- the valve: valve housing (1), flow limiter(2), valve-seat (3), valve-plug (4), balanced unit (5), valve stem (6);
- the actuator: impulse pipe (7), actuator disc (8), springs (9), actuator stem (10), adjusting nut (11), actuator case (12).

Priciple of operation:

The medium flows to the valve chamber (A). The flow limiter (2) is determining the gap size between the chamber (A) and (B). The pressure in the chamber (A) is transmitted through the pulse pipe (7) to the chamber (C) of the actuator. The pressure reigning in the chamber (B) is transmitted through the holes in the valve plug (4) to the chamber (D). The value of differential pressure Dpm decides spring (9). As a result of maintaining a constant differential pressure between the chamber (C) and (D) maintained a constans reduction in the pressure chamber between the Dpm (A) and (B). By maintaining a permanent pressure drop between the chamber (A) and (B) is maintained constant flow of the medium by valve. The size of the regulated flow is controlled by adjustment of the flow limiter (2).

Installation of the controller:

The controller should be mounted on a horizontal pipeline. The direction of flow must be in accordance with an indication of the arrow on the valve body. To ensure the correct operation, the controller must protect by a filter or the magnetic strainer.

Dane techniczne:

Regulatora type			RQB (flanged)
Diameter DN			15	20	25	32	40	50
Flow Kvs			3,2	5	8	12,5	20	32
Pressure PN			25 bar
Water flow m³/h for measuring 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 lub 0,5 bar
	Dm=160		0,2 lub 0,5 bar			-
Max. pressure difference			12 bar
Max. temp. of the medium			180 ° C
Max. pressure in the chamber of the actuator			25 bar

Flanged connetion PN25, PN ISO 7005-1

Regulatora type			RCQoBm (screwed)
Diamater DN			15	20	25
Flow Kvs			3,2	4,5	6,3
Pressure PN			16 bar
Water flow m³/h for measuring pressure drop	0,2 td>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 or5 bar
Max. valve pressure			bar
Max. temp.			° C
Max. actuator pressure			ar

Dimmensions [mm]:

DN	15	20	25	32	40	50
H1	76,5	82,5	82,5	94	102	110
H2	63	66	66	-	-	-
H1max	215	223	226	246	248	270
H2max	172	177	177	-	-	-
L1	130	150	160	180	200	230
L2	75	80	85	-	-	-

Selection of the flow controller RQB