HYDRAULIC CONTROL VALVES HYDROBLOC SYSTEM

The Hydrobloc system offers a full range of automatic control valves based on the association of a hydraulically operated, diaphragm actuated main valve and the combination of one or several suitable pilot valves. BAYARD has developed a modular system by the combination of 5 basic applications. Bayard Engineering is dedicated to the study of any solution to meet your needs (Over 1000 combinations - See page 18 to 19). Bayard’s expertise of the Hydrobloc system benefits from 30 years of experience on site and in our R&D test laboratory. Basic applications • Pressure control • Flow control • Level...

Structure of a Hydrobloc control valve The Hydrobloc main valve is line pressure actuated and pilot controlled. Main valve • on main valve (Page 3 and 4) • additional functions (Page 6) • optional equipment (Page 17) Pilot system Hydrobloc main valve Designation 7 * Not shown, specific for each application, on request ** According to valve type, on request Body Bonnet Seat Ductile iron Ductile iron Bronze (stainless steel option) 4 Trim Cast iron, stainless steel, rubber 5 Diaphragm Textile reinforced rubber 6 Valve Disc EPDM 7** Visual position indicator Brass, glass 8** Pressure gauge(s) Stainless...

Basic main valves : other models • Double chamber • Angle pattern • Built-in check valve (for double chamber) Scheme of installation For easy commissioning and maintenance, it is advised to install the valve as described below. 6 1 1. Gate valve OCA2 2. Stainer box 4. Flanged adaptor Major or MDA dismantling joint 6. Air valve with isolating cock Hydraulic characteristics ■ K factor (globe pattern) DN K ∆p in mW.H. (K = Head loss factor, V = velocity in m/s) ■ Cavitation diagram Inlet pressure (bar) Select the DN according to available pressure drop ∆p and velocity V in the inlet flange • Zone...

Single chamber Main valve A 230 B 173 C min. 132 C 232 C max. 414 H 75 D 85 E 50 Weight Single chb14 Kg Dble chb21 C min. without visual position indicator C with visual position indicator C max. with optional telemetric head On some valves, the pilot circuit can be larger than the overall dimensions of the main valve E = Thickness of orifice plate flange holder (flow limiting or overspeed valve). According to execution, this one can be fitted either on downstream or on upstream flange or installed further down or up the pipe. *H = Dimension to add to dimension “C” for height of double chamber...

Pilot circuit elements According to the selected pilot arrangement, Hydrobloc valves achieve following applications : ■ Pressure control • Pressure reducing • Pressure sustaining • Pressure relief ■ Flow control • Rate of flow (non compatible with overspeed) • Hydraulic check valve (non compatible with reverse flow) • Reverse flow • Overspeed ■ Level control • Altitude Closing at an adjustable constant maximum level Valve fully open until 0.30 m of max. level. Throttling according to demand until closing. •“SAVY” float control (2 levels) • “VEGA” float control Closing at constant level. • “RAF”...

Summary of common applications Single Function Three and more functions "Hydrostab" Pressure sustaining / pressure relief "Hydrostab" Pressure sustaining / pressure reducing "Hydrostab" Pressure sustaining / pressure reducing / flow control "Hydrostab" Pressure reducing / stabilizing "Hydrostab" Two level pressure reducing, with solenoid selection "Hydrobloc" slow filling / pressure reducing "Hydro" Differential / pressure reducing "Hydro-Savy" float "Hydro-Savy" / pressure sustaining "Hydro-Vega" / pressure relief OPEN LIST Other combinations can be studied according to specific conditions,...

PRESSURE CONTROL ■ DN 50 to 700 PN 25 ■ DN 800 to 1000 PN 16 ■ Flanges drilled ISO PN 10, 16 or 25 “HYDROSTAB” PRESSURE REDUCING VALVE (PRV) Ref. K1 10 ■ Application Automatically reduces a higher inlet pressure to a steady lower downstream pressure regardless of variations of flow and/or of inlet pressure. ■ Adjustment ranges • Standard spring 1 to 20 bar (DN 50 to 700) • Other springs 0.2 to 2 bar (DN 50 to 700) 15 to 25 bar (DN 50 to 350) ■ Special requirements DN > 700, please contact us EXAMPLES OF MULTIPURPOSE VALVES • “Hydrostab” pressure reducing, solenoid operated shut off valve • “Hydrostab”...

“HYDROSTAB” PRESSURE SUSTAINING / RELIEF VALVE Ref. K1 20 ■ Application Maintains a constant upstream pressure, by either sustaining or relieving excess pressure to the downstream side. ■ Adjustment range • Standard spring 1 to 20 bar (DN 50 to 700) • Other springs 0.2 to 2 bar (DN 50 to 700) 15 to 25 bar (DN 50 to 350) ■ Special requirements DN > 700, please contact us “HYDROSTAB” PRESSURE REDUCING / SUSTAINING VALVE Ref. K1 50 ■ Application Reduces a higher inlet pressure to a constant lower downstream pressure. Sustains a minimum upstream pressure. Adjustment ranges • Standard springs 1 to...

FLOW CONTROL ■ DN 50 to 700 ■ PN 16 ■ Flanges drilled ISO PN 10 or PN 16 “HYDRO” FLOW LIMITING VALVE Ref. K2 10 ■ Application Prevents excess flow regardless of variations of inlet / outlet pressures. ■ Adjustment range • V* = 2 to 4 m/s (general) • V* = 1 to 2.5 m/s (low ∆P) V* = Inlet flange flow velocity ■ Special requirements Please contact us for : • Extremely low or high ∆P • PN > 16 bar • DN > 700 EXAMPLES OF MULTIPURPOSE VALVES •“Hydro” flow limiting / pressure reducing valve •”Hydro” 2 rates flow limiting valve with electrical selection •/…

“HYDRO” OVERSPEED VALVE Ref. K2 20 ■ Application Automatically closes in an adjustable time and permanently locks when flow overpasses pre-set value on downstream pipe burst. ■ Adjustment ranges • V* = 2 to 4 m/s (general) • V* = 1 to 2.5 m/s (low ∆p available) V* = Inlet flange flow velocity ■ Special requirements Please contact us for : • PN > 16 bar • DN > 700 ■ Two-step closing • Optional up to DN 150. • Standard for DN 200 and over. “HYDRO” DIFFERENTIAL VALVE Ref. K1 30 ■ Application Maintains a constant differential pressure regardless of the pressure and flow values, in order to balance...