GAL Catalogue
44Pages

AUTOMATIC CONTROL VALVES

INTRODUCTION DOROT AUTOMATIC CONTROL VALVES is pleased to present the latest edition of their catalogue. This new catalogue includes new models as well as modifications of previous products. The updated information in this edition invalidates the data of the previous edition. This catalogue does not replace other technical publications such as the design manual which is available from DOROT. We are confident that you will be able to use this catalogue as a convenient guide for choosing among the wide range of DOROT products. To enable the user to easliy select the valve model which best...

METAL VALVES DESCRIPTION The direct-sealing diaphragm Valves are operated by pipeline pressure or by air pressure: (which is equal to the pipeline pressure). The reinforced rubber diaphragm seals the water passage when the line pressure reaches the valve's control chamber. Relieving the pressure from the control chamber causes the valve to open. The valve's only moving part is its diaphragm: no shaft, seals, or bearings are located within the water passage. A spring above the diaphragm ensures "valve closure" regardless of pressure level or flow conditions. DOWNSTREAM CLOSED VALVE OPENED...

METAL VALVES SIZE & DIAPHRAGM SELECTION GUIDE This graph provides a guide (based on flow rate and line pressure factors) for selecting the proper valve, pressure rating, size, and diaphragm type. Line Pressure psi mwc SIZE (INCHES) 360 250 HIGH PRESSURE MODELS SIZE (INCHES) LOW PRESSURE SPECIAL DIAPHRAGMS L O C AT E T H E F L O W R AT E O N T H E H O R I Z O N TA L A X I S A N D D R AW A L I N E U P WA R D S . L O C AT E T H E L I N E P R E S S U R E O N T H E V E R T I C A L A X I S A N D D R AW A L I N E T O T H E R I G H T. The point of intersection of the two lines (see examples A+B)...

MODEL SELECTION TABLE 44 CAST IRON CAST IRON CAST IRON CAST IRON CAST IRON DUCTILE IRON MODEL PATTERN DUCTILE IRON DUCTILE IRON * HIGH PRESSURE MODELS (PN 25) 24" 20" /

METAL VALVES PRESSURE RATING The pressure rating of the "gal" valves is determined by the body strength and the diaphragm type. Models: 44, 45, 47, 53, 77, 82, 84, 87, 91 are rated PN16 (maximal operating pressure of 160 mwc, 230 psi). Models: 67, 94 are reted PN25 (maximal operating pressure of 250 mwc, 360 psi). In case a low-pressure diaphragm (see graph, page 2 in this catalogue) is assembled in the valve, and the specific diaphragm should not be used at the standard pressure limits, the valve will be rated and its tag marked according to the diaphragm operating pressure limitation....

THE FACTORY RESERVES THE RIGHT TO MODIFY SPECIFICATIONS WITHOUT PRIOR NOTICE.

METAL VALVES The standard valve can be converted into a special model by replacing the standard bonnet with one of the special kits described below. A standard body and diaphragm are used in the optional valves. The conversion can be carried out on site, or supplied as a "special bonnet" model by the factory. The code letter for each special bonnet model is indicated below (I, T.) THROTTLING BONNET POSITION INDICATING BONNET Offers visual and electric indication of the valve's position. Available in sizes 2" - 24". For the reduction of pressure and flow rates. Available in sizes 2" - 4", on...

ORDERING GUIDE Example: Selected is a 6" valve, flanged, cast iron, with position indicator and special low-pressure diaphragm. Connection standard is BS10 table D. SPECIAL BONNET (IF REQUIRED) T THROTTLING BONNET I POSITION INDICATING BONNET CONNECTION STANDARD ISO PN16, ANSI CLASS 125, BS 10/D, OR OTHER SPECIAL DIAPHRAGM (IF REQUIRED) SEE GRAPH A (PAGE 2) FOR DIAPHRAGM SERIAL NUMBERS FOR CONTROL FUNCTIONS SEE SECTION F.

PLASTIC VALVES DESCRIPTION The direct-sealing diaphragm valves are operated by line pressure . The reinforced rubber diaphragm seals the water passage when line pressure reaches the valve's control chamber. Relieving the pressure from the control chamber, to the atmosphere or to downstream, causes the valve to open. The valve's only moving component is its diaphragm; no shaft, seals, or bearings are located within the water passage. The valve is made of sturdy, high-quality materials. It is produced in a number of structurally different versions (throttling, built-in solenoid operator,...

SIZE SELECTION GUIDE This graph provides a guide, based on flow rate and pressure, for the proper selection of valve size. psi mwc 140 100 Line Pressure Locate the flow rate on the horizontal axis and draw a line upwards. Locate the line pressure on the vertical axis and draw a line to the right. The intersection point of the two lines marks the appropriate valve size. Example: line pressure 28m (40 psi), flow rate 23 m 3 /h (100 gpm), appropriate valve = model 75-2" PRINCIPLE OF OPERATION 1 3-WAY CONTROL This control device admits pressure into the control chamber, closing the valve, or...

PLASTIC VALVES HEADLOSS CHART 3-WAY CONTROL MODEL 75, 95, 96 (BLUE AREA INDICATES RECCONENDED OPERATING RANGE) PRESSURE RATING SPECIFICATIONS MATERIALS VALVE: BODY BONNET DIAPHRAGM SPRING SPRING SEAT NUTS AND BOLTS SOLENOID OPERATOR: COIL PLUNGER SEAL CONNECTIONS MODEL 75: 30% GLASS REINFORCED POLYAMIDE MODELS 95, 96: uPVC 30% GLASS REINFORCED POLYAMIDE NATURAL RUBBER SST 302 POLYAMIDE COATED STEEL OR SST 304 THREAD: FEMALE ISO (BSP), ANSI (NPT) SOLVENT WELDING: BS 4346.1/ASTM D2467/AS 1477 ISO 727, DIN 8063. POLYESTER-COATED STEEL SST BUNA-N OR NR ELECTRICAL DATA 8 WATT OPERATOR: VOLTAGE...

COMPONENTS Specify model code and size when ordering spare parts. Example: Part no. 4 for 75 - 2 - E/D2 2 SHORT BOLT 3 2-WAY BONNET 8 MANUAL ACTIVATION RING DESCRIPTION 75-3WAY 1 LONG BOLT DESCRIPTION 95, 96 1 LONG BOLT 12 3-WAY CONTROL VALVE ADAPTOR ORDERING GUIDE 1 Select valve size, using the "size selection" graph located on page 9. 2 Select valve model, using table on page 10. Example: selected, is a 2" valve, made of glass-reinforced polyamide, controlled by a 2-way solenoid operator. CONNECTION STANDARD (THREADED MODELS ONLY) NPT, BSP STRUCTURAL VERSION (WHEN APPLICABLE) T, E/D2,...