2x21 Contol valves and fail-safe action valves
DN 25 to 400, PN 16, 25 and 40, Kvs 4 to 1600 m3/h

Control valves RV/HU 2×2 are single-seated valves with pressure-balanced plug designed for regulation of process medium flow. In regard of used actuators, the valves are suitable for regulation at high differential pressures with low-linear-force actuators. Flow characteristics, Kvs values and leakage rates correspond to international standards. The fail-safe action valves series HU 2×2 are of the same design with increased seat tightness. The valves are designed for connection to electrohydraulic fail-safe function actuators (the valve closes upon power supply failure.
The valves series RV/HU 2×2 are equipped with hand wheel or they are especially designed for actuators of the following producers: Ekorex+, ZPA Nová Paka, Johnson Controls, Schiebel, Auma, EMG – Drehmo, Rotork, Honeywell, Fisher – Rosemount, Foxboro, Regada, SPA Praha, ZPA Pečky.

These valves have a wide range of application in heating, ventilation, power generation and chemical processing industries. Valve body can be optionally made of spheroidal cast iron, cast steel and austenitic stainless steel according to operating conditions.

Process media
Valves series RV/HU 2×2 are designed for regulation of flow and pressure of liquids, gases and vapours without abrasive particles e.g. water, steam, air and other media compatible with material of the valve inner parts. The usage of the valve made of spheroidal cast iron (RV/ HU 212) for steam is limited by the following parametres. The steam must be superheated (its dryness at valve outlet x >= 0,98) and inlet pressure p1 <= 0,4 MPa when differential pressure is of above-critical value and p2 <=1,6 MPa when differential pressure is of under-critical value. In case these two conditions are not kept, it is necessary to use the value made of cast steel (RV/HU 222). To ensure a reliable regulation, the producers recommends to pipe a strainer in front of the valve into pipiline or ensure in any other way that process medium does not contain abrasive particles or impurities.

Catalogue sheets
01-02.1 LDM valves with electromechanic actuators GB, RUS
01-05.1 LDM valves with Johnson Controls actuators GB
01-08.1 LDM valves with SPA Praha actuators GB
01-08.3 LDM valves with pneumatic actuators Foxboro GB