Technote. Frese YDF-2F & YDF-20F - differential pressure control valve. Application. Benefits. Features.
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1 Page 1 of 5 Application Frese YDF-2F and YDF-20F differential pressure control valves are used in central heating-, ventilation-, and district heating systems This model is a high-performing adjustable differential pressure control valve (DPCV) installed in the supply or return piping line of loaded equipment, that ensures the differential pressure across the load or circuit is constant. Benefits Features Design The valve construction integrated with the Equal % Cone provides additional wide range of control of differential pressure and flow Being diaphragm split-system, there is no influence by temperature and being perfect balance type, solid set pressure-differential value is ensured Strong construction guarantees high durability. Being diaphragm type, installation in the horizontal and the vertical position is possible Easy to install and adjust according to selection diagram Maintenance time will be referred in acc. with whether leaking water visually Valve lifting can be checked thru the installed indicator Standard sizes from DN25 to DN150 Sizes from DN200 to DN300 on request Pressure class PN16 or PN25 Operation High comfort for the end-users due to no noise problems from control valves Easy adjustment of the pressure by Equal % Cone
2 Page 2 of 5 Technical data Dimension & Weight Model YDF-2F (PN16) Size L H1 H2 Weight (kg) DN DN DN DN DN DN DN DN DN DN DN DN Dimension & Weight Model YDF-20F (PN25) Size L H1 H2 Weight (kg) DN DN DN DN DN DN DN DN DN DN DN DN
3 Page 3 of 5 Specifications Items YDF-2F YDF-20F Pressure class PN16 PN25 Applicable fluid Hot & cold water Flow temperature Max C Construction Differential pressure adjustment range (kpa) kpa or kpa Flange connection EN PN16 EN PN25 Materials Body Cast Iron Cast Steel EPDM Connection parts, 2 sets Capillary cupper tube ø6.35 x 0.9 L= 2m Manometer 1/4 connection Ball valve 1/4 Tee 1/4 Nipple 1/4 Extension pipe 1/4 Product program Size DN25 DN32 DN40 DN50 DN65 DN80 DN100 DN125 DN150 DN200 DN250 DN300 Control range [kpa] YDF-2F PN16 YDF-20F PN
4 Page 4 of 5 Construction Drawing Pin Spring case Yoke Packing Guide Seat Adjustable screw Actuator spindle plate Indicator Cone stem Top flange Cone Body Selection of valve size 1000 G(m3/h) Cv: Coeffience of valve Q: Flow (m 3 /h) r: Density (water = 1) ΔP: Differential pressure across valve (Bar) G(m3/h) P(kpa) P(kpa) Size Cv DN25 8 DN DN40 18 DN50 32 DN65 50 DN80 72 DN DN DN DN DN DN
5 Page 5 of 5 How to adjust differential pressure 2. Loosen the lock nut along the direction of arrow indicated 1. Hold it to be fixed until the lock nut is loosened Clockwise: increase of differential pressure Counterclockwise: increase of differential pressure How to adjust differential pressure Make sure to fully comprehend the following cautions in handling the products so that the product may display it performance. 1. Do not apply any impact on it 2. Avoid any place with dust or humidity when storing it 3. A special attention should be paid so that any impurities are not inserted into the product 4. When attaching it onto a pipe, the location should be free of sand or debris while a point of gasket should be also cleaned up 5. It should be installed on a place easy to access for repair * The structure, dimensions and materials may be changed without any prior notice for the improvement of performance. Maintenance tips Stuffing nut box packing leaking 1. Locking after checking gate valve - Main valve locking 2. Pressure pipe valve locking 3. Slowly loosening after checking the height of the spring speciefied 4. Seperating the pressure pipe 5. Loosening after checking the height of indicator 0 Øs stamp thread 6. Slowly loosening Stuffing nut box - Stop diassembly if water continuously flows 7. Checking and replacing the packing and reversely assembling it O-ring leaking 1. Checking and locking gate valve 2. Pressure pipe valve locking 3. Checking and slowly loosening the height of spring specified 4. Separating the pressure pipe 5. Loosening after checking the height of stamp thread 6. Disassembling the actuator 7. If it s rusty excessively, it should be ground with soft sand paper 8. Replace O-ring and assembling it Frese A/S assumes no responsibility for errors, if any, in catalogues, brochures, and other printed matter. Frese A/S reserves the right to modify its products without prior notice, including already ordered products, if this does not alter existing specifications. All registered trademarks in this material are the property of Frese A/S. All rights reserved. Frese A/S Sorøvej 8 DK Slagelse Tel: Fax: info@frese.dk
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