Pumps are common engineering devices which have become important sources of power to operate several commercial devices around us. Operation of these devices need complex mechanisms, however there are many novel pumps which exist in nature and operate without any external source of power. In this paper some of these devices have been reviewed. Liquid piston engines also fall in same category of these devices which use pressure fluctuations to pump fluid. Design and Working of these novel pumps has been discussed and future recommendations made to improve the current designs.Pumpe su uobičajeni strojarski uređaji koji su postali bitni izvori energije za upravljanje raznih komercijanih uređaja oko nas. Za upravljanje tim uređajima potrebni su složeni mehanizmi, no mnoge nove pumpe postoje u prirodi i rade bez ikakvih vanjskih izvora energije. U ovom su radu ispitani neki od tih uređaja. Rotacijski motori bez klipova također spadaju u istu kategoriju uređaja koji koriste promjene tlaka za ubrizgavanje goriva. Razmotreni su izrada i način rada tih novih pumpa i učinjene su preporuke za popravljanje dizajna
