Portal de Periódicos da CAPES

Design and development of water hydraulic pressure compensated flow control valve

2002; Volume: 9; Issue: 6 Linguagem: Inglês

0975-1017

Saurabh Pandharikar, Abhijit Khuperkar, Neetesh Soni, Rishav Agrawal,

Oil and Gas Production Techniques

T he Prcssure Compensatcd Flow Contro l Valves (PCFCVs) are required fo r mainta ini ng consta nt fl ow in a hydra uli c c ircu it as the re is fl uc tu ati o n in supply or return pressure and o th e r res istan ce o n ac tu ato rs. T he wate r hydraul ic PCFCV has been desig ncd wh ic h can cont ro l th e load fl ow as well as pump pressure. For achi evin g constant tl ow require me nt , a hydrostate has been desig ned whi c h maint ai ns a consta nt d iffere ntia l p ressure across a ma nu a ll y sellable va lve and hencc main ta in constan t fl ow across th e valve. T he pump pressure cont rol is achi eved by cont ro llin g th e sens in g lin e pressure o f hyd rostate w ith th e he lp o r an air pi sto n actu ated p ilo t o pe rated re li e f val ve. T he paper disc usses concept ua l des ig n. math c m3ti calmodc llin g. pa ra me te r o pti mizati o n a nd des ig n of PCFCV. Flow cont ro l is import ant in hydrauli c circuits l • 4 sin ce it direc tl y dea ls with rate of energy transfe r. To con tro l th e tl ow , va ri ous types of va lves are used lik e simp le ori fice , press ure co mpensated res tri cted type, press ure co mpensated by pa ss type, press ure and temperatur e co mpensated type, pri ority type, flow dividers, etc. Most of th e va lves ava il abl e in mark et are developed fo r oil hydrauli c applic ati ons s . Success ive development in hydrauli c component s and flui ds , parti cularl y over las t 15 years, has led us to use mix ture o f' oil and water, and now pure water as wo rkin g fl uid fo r various appli cati ons lik e food indu str ies , stee l in dustri es, power sector, ag ri cultural equipments, etc. The wa ter hydrauli c co nt ro ls are be in g used exte nsive ly in Indi an nu clear power pl ant s 6 . A distin gui shin g fea ture of Indi an Press uri zed Heavy Water Reac tors (PHWR) is th e capabilit y to re fu el th e reactor even at full power opera ti on, i.e . at 100 bar an d 300°C of heavy wa ter (0 20 ) workin g as coolant fl uid. It elimin ates long and cos tl y out age and also permi ts reactor to be operated with less excess reacti vit y. Th e o n power refu ellin g is carri ed out with th e help of robo tized Fu ellin g Mac hin es (FM s), located at each end of one ho ri zo nt al coolant channel, whic h is to be refuell ed. These FM s operate re motely and handl e hi ghl y radi oactive fuel bundl es lyin g in coolant chann el. During refillin g, th e clos ure plugs