Self-acting Pressure Reducing & Surplussing Controllers - RCRUB, RCUB type.

The Self-acting Pressure Reducing & Surplussing Controllers have been designed for aplications in district heat substations and idustrial installations. Pressure Reducing & Surplussing controllers type RCRUB maintain constant pressure in installations in ranges 0,2-1.6 ; 1-2,8 ; 1-3,5 lub 2.5-7 bar. Type RCUB is desired to adjust the differential pressure Δp in the same ranges as RCRUB. The controllers type RCRUB and RCUB are suitable for 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:

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

Construction:

Self-acting differential pressure controllers are proportional controllers, controlled by the regulated medium. For ensure a stable of work valve plug (3) is balnced by the balancing bellows (4).

Priciple of operation:

The medium flows through the valve chamber (A) as indicated by the arrow. A control signal is transmitted by the impulse pipe (6) to the actuator chamber B. At RCRUB type the chamber (C) is conected with atmosphere. At RCUB type the control signal lower pressure is transmitted by the impulse pipe (7) to the actuator chamber C. Here pressure is converting into a positioning force. This force moves the diaphragm (8) according to the force of the spring (9), which is adjustable by the adjusting nut (11). 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 pressure overcomes the force on the spring (9), the valve is opening proportionally to the changes in pressure, to the moment when the pressure difference between the chamber B and C will be equal to the force on the spring (9). Normally the valve-plug (3) is closed.

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.

Technical data:

Series		RCRUB (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	RCRUBm (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 difference - bleed valves RCRUB flanged	Pressure difference - bleed valves RCRUBm 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 rangeΔp [bar]	0,2...1,6	1...3,5	2,5...7	0,2...1,6	1...2,8
Actuator series	Dm=160			Dm=240

Selection of the surplussing controller