Self-acting Pressure Reducing Controllers - RCRB

The self-acting pressure reducing controllers provides maintaining a constant set pressure within the 0,2-1,6; 1-2,8 and 1-3,5 bar. They are designed to control cold or hot water (temperature up to 180°C for RCRB controllers and up to 150°C for controllers RCRBm) and non-flammable gases of temperature up to 80°C. For steam are required condensig vessels.

Key Features:

• Installation on upstream or downstream,
• 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 (3) is balanced (4). The controller consisting of two units:
- valve: valve body (1), valve-seat (2), valve-plug (3), balanced unit (4), valve-stem (5);
- actuator: impulse pipe (6), actuator discs and diaphragm (8), springs (9), actuator-stem (10), adjusting nut (11), actuator-body(12).

Priciple of operation:

Medium flows to valve chamber (A). The control signal higher pressure is transmitted by the impulse pipe (7) to the actuator chamber (B). The actuator chamber (C) is connected with atmosphere. Size of the gap between the valve-seat (2) and the valve-plug (3) is depending on constant difference pressure between chamber B and C. When downstream pressure overcomes the adjusted set point, the valve closes proportionally to the changes in pressure. Value of pressure is setting by adjustment nut (11). This actuator is designed to normally position the valve open.

Installation:

For ensuring good work the controller 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. For steam are required condensig vessels.

Technical data:

Series		RCRB (flanged)
Diameter DN		15	20	25	32	40	50
Flow factor Kvs		3,2	5	8	12,5	20	32
Pressure PN		25 bar
Adjust range	Dm=240	-			0,2-1,6; 1-2,8 bar
	Dm=160	0,2-1,6; 1-3,5 bar			-
		2,5-7 bar
Max. pressure diference		12 bar
Max. temprature		180°C
Max. pressure in the actuator chamber		20 bar

Flanged connectors PN25, PN ISO 7005-1

series	RCRBm (screwed)
Diameter DN	15	20	25
Flow factor Kvs	3,2	4,5	6,3
Pressure PN	16 bar
Adjust range Dm=160	0,2-1,6; 1-3,5; 2,5-7 bar
Max. pressure diference	12 bar
Max. temprature	150°C
Max. pressure in the actuator chamber	16 bar

Dimensions [mm]:

Pressure reducing valves RCRB flanged	Pressure reducing valves RCRBm screwed

DN	15	20	25	32	40	50
H1	47,5	52,5	57,5	70	75	82,5
H2	28	31	33	-	-	-
H1max	336	344	347	360	362	384
H2max	318	344	333	-	-	-
L1	130	150	160	180	200	230
L2	75	80	85	-	-	-

Values range

Indicate value range	16	35	70	16	28
Adjust range Δ p [bar]	0,2...1,6	1...3,5	2,5...7	0,2...1,6	1...2,8
Actuator series	Dm=160			Dm=240

Seletion of the pressure reducing controllers