Pressure regulators
Self-operated regulators
Direct-acting pressure reducing valves for steam, water and gases. The equipment automatically maintains the set outlet pressure without electrical power, compressed air or an external control signal.
Operating principle
Self-operated pressure control
The regulator uses the energy of the process medium itself. A change in the outlet pressure is sensed by the sensing element and directly moves the control element of the valve.
Application
The regulators are used as stand-alone devices or as components of pressure reducing stations to reduce and stabilise the pressure of liquids, gases and steam.
- RV-G — grey cast iron body, nominal pressure PN 16.
- RV-Č — cast steel body W.Nr. 1.0619, nominal pressure PN 40.
"G" diaphragm
A sensing element with a synthetic rubber diaphragm is used for set pressures from 0.05 to 3 bar.
"K" bellows
A W.Nr. 1.4571 bellows unit is used for set pressures above 3 bar and up to 12 bar.
Design
Two functional units
The pressure reducing valve consists of a control unit and a sensing element. They are connected by an impulse line whose length is chosen according to the temperature of the process medium.
For steam and media with a temperature above 120 °C, an extended connecting tube is used to reduce the thermal load on the diaphragm or the bellows.
- 01Sensing elementRubber diaphragm or W.Nr. 1.4571 bellows
- 02Control unitBody, seat and control plug
- 03Connecting tubeTransmits the pressure to the sensing element
- 04Adjusting screwSetting of the required outlet pressure
Technical parameters
Main designs
The production range includes four basic designs that differ in body material and in the type of sensing element.
| Type | PN | DN | Body material | Seat / plug | Sensing element | Setting range |
|---|---|---|---|---|---|---|
| RV-GG | 16 | 15/15–150/150 | Grey cast iron | Stainless steel | Rubber diaphragm | 0.05–3 bar |
| RV-GK | 16 | 15/15–150/150 | Grey cast iron | Stainless steel | W.Nr. 1.4571 bellows | 3–12 bar |
| RV-ČG | 40 | 15/15–150/150 | W.Nr. 1.0619 | Stainless steel | Rubber diaphragm | 0.05–3 bar |
| RV-ČK | 40 | 15/15–150/150 | W.Nr. 1.0619 | Stainless steel | W.Nr. 1.4571 bellows | 3–12 bar |
Fully self-operated
No electrical power, compressed air or external controller is required.
Maximum setting pressure
Up to 12 bar for the PN 16 and PN 40 designs.
Process media
Water, steam, industrial gases and compatible process liquids.
Installation in pressure reducing stations
Stand-alone installation or integration into a complete pressure reducing assembly is possible.
Engineering selection
Selecting the regulator and the pressure drop
Selection is based on the flow rate, the process medium, the inlet and outlet pressures, the temperature and the required setting range.
Allows a substantial pressure reduction in a single stage when the flow capacity is correctly selected.
Permits a large pressure drop, but the flow velocity and the noise level have to be checked.
With a large pressure drop, the rise in velocity, possible erosion and the service life of the control unit must be taken into account.
In practice it is recommended not to exceed 4:1. For a larger drop, staged pressure reduction is considered.
The minimum flow rate should be at about 40 % of travel and the maximum at about 60 % of the valve travel.
PN 16
Permissible working pressure
| Temperature, °C | 120 | 200 | 250 | 300 |
|---|---|---|---|---|
| Working pressure, bar | 16 | 15 | 14 | 13 |
PN 40
Permissible working pressure
| Temperature, °C | 200 | 225 | 250 | 275 | 300 | 325 | 350 | 375 |
|---|---|---|---|---|---|---|---|---|
| Working pressure, bar | 40 | 38 | 36 | 34 | 32 | 30 | 28 | 26 |
| Temperature, °C | 400 | 410 | 425 | 430 | 435 | 440 | 445 | 450 |
|---|---|---|---|---|---|---|---|---|
| Working pressure, bar | 25 | 24 | 22 | 21 | 20 | 19 | 18 | 17 |
Technical documentation
Diagrams and dimension tables
Open the section you need. Each image can be enlarged to view designations, overall dimensions and tables.
Engineering support
We will select a regulator to match your process parameters
Our specialists will determine the type of sensing element, the nominal size, Kv, the body material and the permissible pressure drop.