RD1221

BEE line

RD 122 D a RD 122 P

Self-acting differential pressure regulator
Self-acting differential pressure regulator with flow limitation

DN 15 to 50, PN 25, Kvs 0,63 up to 32 m3/h



Description
Self-acting regulator of differential pressure series RD 122 D is designed to keep a constant differential pressure value of given appliance. Such a function is ensured by a diaphragm exposed to effects of inlet and outlet pressure of the appliance. Deflections of the diaphragm transfer to the valve plug and it closes the valve upon increase of differential pressure value. Owing to a pressure-balanced plug, value of differential pressure is not affected by pressure ratios within the valve.
Self-acting regulator of differential pressure with flow limitation RD 122 P is designed especially to ensure maximum flow rate required in an appliance. Such a function is ensured by two plugs one of which is adjustable to the value required by the user, and the other is controlled by differential pressure with the aid of diaphragm head. Deflection of the diaphragm transfer to plug and it closes the valve upon the increase of differential pressure value. Pressure-balanced plugs ensure a reliable function and stability of set value within the whole of both available and differential pressure ranges.
In case when required value of differential pressure is within two spring ranges, it is more suitable to select the range with lower values to ensure the sensitivity of regulator
Connecting impulse pipe for extraction of pressure before the appliance is withing the scope of supply as standard. Outlet pressure is supplied into the regulator head directly from the valve.

Application
These valves are designed for application in common warm-water and hot-water heating circuits, refrigerating and air-conditioning with max. differential pressure of 1,6 MPa.
Application of the differential pressure regulator with flow limitation is suitable everywhere where there is a need to ensure nominal flow rate through an appliance at a maximum level and at the same time limit the output of extraction spot when starting etc.

Process media
Valves series RD 122 are suitable for process media such as water, air or low-pressure steam up to 0,4 Mpa of pressure. In addition, they are suitable for cooling mixtures and other non-aggressive media and gases with temperature range +2°C to +150°C. Sealing surfaces of the trim are resistant to common sludge or water impurities. Yet it is recommended to pipe a strainer in front of valve to ensure a reliable function and tightness in case there are abrasive particles present in the process medium.

Catalogue sheets
01-01.2
Self-acting differential pressure regulator
Self-acting differential pressure regulator with flow limitation
CZ, GB, D, RUS, PL