Self-acting differential pressure controllers
Differential Pressure Controllers - RCB flanged
Differential Pressure Controllers - RCBm screwed
Differential Pressure Controllers - RCB - construction
The self-acting differential pressure controllers are most suitable for applications such as controlling differential pressure between upstream and downstream sides of a water circulation, heating system or industrial installations. The differential pressure controllers are used to maintain a fixed differential pressure in ranges 0,2-1,6; 1-2,8, 1-3,5 or 2,5-7 bar. They are suitable to cold water, hot water (up to temperature of 180° C for regulators and RCB type and up to 150° C for regulators RCBm type) and non-flammable gases up to 80° C.
Special Features:
- high quality regulation,
- maintenance-free,
- regulation without the involvement of external energy.
Construction:
The self-acting differential pressure controllers are controlled by the regulated medium. For ensure a stable of work valve plug (3) is balnced by the balancing bellows (4). The devices consist of two parts: - a valve: valve body (1), seat (2), plug (3), balancing bellows (4), plug stem (5); - an actuator: pulse pipes (6) and (7), drives the actuator (8), springs (9), the actuator stem (10), a set point adjuster (11), actuator housing (12).Principle Of Operation
The medium flows through the valve chamber (A) as indicated by the arrow. Control signal higher pressure is transmitted by the impulse pipe (7) to the actuator chamber B. Control signal lower pressure is transmitted by the impulse pipe (6) 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 downstream pressure overcomes the pressure set point on the spring (9), the valve closes 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 open.
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 | RCB (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 differece
on the valve |
12 bar | ||||||
| Max. temperature | 180°c | ||||||
| Max. pressure in
actuator chamber |
20 bar | ||||||
Flanged connectors PN25, PN ISO 7005-1
| Series | RCBm (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 difference
on the valve |
12 bar | ||
| Max. temperature | 150°c | ||
| Max. pressure in
the actuator chamber |
16 bar | ||
Dimensions [mm]:
Differential Pressure Controllers RCB flanged
Differential Pressure Controllers RCBm 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 | - | - | - |
Value ranges:
| Indicate value range | 16 | 35 | 70 | 16 | 28 |
| Value 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 | |||
Selection of the differential pressure controller