Need Valves
8Pages

DI NICOLA INFINAM S.r.l. Via Mazzini, 11 - 66020 San Giovanni Teatino (CH) ITALY Tel. +39 085 9049480 - Fax +39 085 9049481 www.dinicolavalves.com - sales@dinicolavalves.com

GENERAL CHARACTERISTICS The network has gained increasing importance trying to conciliate available water reserves and the always increasing request for water. Usually, the network capacity is always greater than the effective request; this implies the necessity to utilize devices able to control the distribution of the water without wasting it. Needle valve is especially designed to realize the function of regulating the water flow, maintaining an easy handling even in circumstances which comport heavy hydrostatic loads at its mouth and a very different excercise pressure. The use of...

1) Body: spheroidal cast iron GGG50 - Fe S275JR 2) Stem: stainless steel AISI 420 - AISI 316 3) Crank: spheroidal cast iron GGG50 - Fe S275JR 4) Connecting rod: stainless steel AISI 304 - Fe 6) O-ring: neoprene 7) Support: stainless steel AISI 304 - Fe S275JR 8) Sealing rubber: neoprene 9) Collar: stainless steel AISI 304 - Fe S275JR 5) Shutter: stainless steel AISI 304 - AISI 316 Larger diameters are also available on request on electrowelded steel. Our firm reserves the right to make any technical changes without any notice to the client .

DOCUMENTATION Report made on the bases of the “Di Nicola” valve testing, realized by “Istituto di Idraulica Agraria - Università di Napoli” (1991). Thecnical report on hydraulic behaviour The following report is to illustrate the technical reasons by which the valve is not subject to cavitation phenomena when used in a correct way. A Pressure course within the valve (fig. 1) Piezometric pressure in the hydraulic network follows the direction indicated on fig. n° 1 Section A Upstream pressure (Hm) = Section C Minimum pressure within the valve = Section D Downstream pressure (Hv) = The...

NEEDLE VALVE DIMENSIONING The needle valve dimensioning is not based on the conduit diameter but on the pressure conditions in exercise and on the maximum and minimum values of the water flow. Required data Dimensioning example Maximum flow required (Q - m 3/s.) Maximum upstream pressure (Hm stat- meters of water column) Upstream pressure at maximum flow (Hm min - m.w.c.) Maximum downstream pressure (Hv max - m.w.c.) 1. 2. Determination ∆Η available on the valve to deliver the flow Q: ∆Η = Hm min - Hv max Determination of the nominal pressure class (NP) PN = 1,5 x Hm stat The nominal...

USE OF THE VALVE This type of valve can be supplied as a solution to several flow control problems. The followings are the most frequently encountered: (a.) Down pressure control Needle valve, with down stream positioned pressure gauge controlled by computer, is a very good solution to keep the pressure constant into the down stream pipe line even in presence of big changes of pressure range into the upper stream adductor pipe line. Principle sketch-plan n 1.)Needle valve 2.)Pressure gauge 3.)Computer 4.)Local control electric diagram 5.)Remote control and signaling panel 6.)Relief valve...

NOTES ON INSTALLATION - Di Nicola needle valve can be installed vertically, remembering to follow the direction of the arrow shown on them - It is possible to install Di Nicola needle valves of dimensions smaller than conduit diameter as their design is studied in base at the flow speed. It is recommended to use a Venturi pipe upstream and downstream of the valve. - In case a dismantling joint is used in conjuction with the valve, it is suggested to install it upstream of the valve. DI NICOLA needle valves can be supplied with a wide range of accessories: * * * ANTICAVITATION RING SLOTTED...

CONSORZIO DI BONIFICA DELLA CAPITANATA FOGGIA SPINDLE VALVE ND 1200 ELECTRICALLY OPERATED ARMINOU (CYPRUS) NEEDLE VALVE ELECTRICALLY OPERATED DI BONIFICA DI NARDO” LECCE NEEDLE VALVE WITH HYDRAULIC ACTUATO