Pressure and Flow Control Valves DBGM, German and European Patents

Absolutely Reliable Pressure and Flow Control In water mains of sizes DN 50 to DN 150, ERHARD Control Valves in straight or angle pattern throttle and control showing excellent results. Globe type ERHARD Control Valves with body of ductile cast iron (SG GGG-50) are equipped with a fixed slotted cylinder of stainless steel. The control piston guided in PTFE lined slide rings moves within this cylinder covering or opening the ports according to the control position required. The actual valve seat which is an integral part of the slotted cylinder seals by means of an O-ring in a bubbletight manner....

For Water Service Size Nominal Pressure Hydrostatic body test pressure in bars Hydrostatic seat test pressure in bars Max. admissible working pressure in bars at a working temperature up to 40° C When placing the order, please specify pressures upstream and downstream of the valve, max. flow rate and flow medium. Flanges DN 50 - 150, C… connecting dimensions to DIN 28 605, PN 162) Prod. no. 6031 95.. connecting dimensions to DIN 28 606, PN 25 Prod. no. 6032 95.. connecting dimensions to DIN 28 607, PN 40 Prod. no. 6033 95.. Face-to-face Face-to-face dimension 4) dimension s L mm mm Handwheel...

Head loss Δp (bar) in completely open position Opening degree of valve in % Qnormal (m3/h) hv at Qnormal (mWC) Qmax (m3/h) Characteristic curves for valves with special slotted cylinder according to operating data. Kvs: The flow coefficient Kvs shows the amount of water in m3/h flowing through the fully opend valve at 5°C to 30°C with a differential pressure of 1 bar. Head loss coefficient under fully open conditions. Qnormal: Flow rate corresponding to a flow velocity of 1,5 - 3 m/s (referring to nominal size). hv: Head loss (Δp) when valve is completely open. Max. admissible flow rate for long-time...

User’s Advantage Universal control valves for water service Equipped with slotted cylinder Optimum flow characteristics Compact design, long piston guide Perfect and reliable operation Components resistant to corrosion and ageing: Body of SG GGG-50/EKB epoxy coated Trim and screws of stainless steel Piston sealing of PTFE/coal and elastomer outside the area of flow and cavitation Long life Replacement of trim without removing the valve from the pipeline Easy maintenance Slotted cylinder with graded control ports Excellent control characteristics – even for small rates Position indicator as a...

1 ERHARD Control Valve 3 Pressure Gauge with Teletransmitter W Set point Y Controller output signal X Controller input parameter YR Signal feedback Pressure Control: constant downstream pressure (Pd) Pressure Control: constant upstream pressure (P2) By-pass Valve: For filling mains with the main valve in closed position Flow Control: constant flow rate (Q) Reservoir Feeding Valve Pump-discharge valve: Minimizing water hammer on closing a long delivery line Postfach 1280 · D-89502 Heidenheim Phone: +49(0)7321 320-0 · Fax: +49(0)7321 3 20-5 25 http://www.erhard.de e-mail: [email protected] Data...