ma valve awiri owonetsetsa ndizotheka kuyang'anira chithandizo ndi kayendetsedwe ka katundu woyimitsidwa mbali zonse za actuation. Zomwe zimagwiritsidwa ntchito pamtundu woterewu zimakhala pamaso pa ma silinda ochita kawiri omwe mukufuna kutseka pakugwira ntchito kapena kupuma. Chisindikizo cha hydraulic chimatsimikiziridwa ndi poppet yowuma komanso pansi. Chifukwa cha chiŵerengero cha woyendetsa, kutulutsa mphamvu kumakhala kochepa kusiyana ndi komwe kunayambitsidwa ndi katundu woyimitsidwa.

Mavavu a VRDF amapezeka ndi ma doko opangidwa ndi BSPP-GAS pamizere yobweretsera ndi yobwerera ndi madoko opindika pamizere yopita ku silinda. Kutengera ndi kukula kosankhidwa, amatha kugwira ntchito ndi zovuta zogwirira ntchito mpaka 350 bar (5075 PSI) ndi 45 lpm (13.2 gpm) kuthamanga. Thupi lakunja limapangidwa ndi chitsulo champhamvu kwambiri komanso kutetezedwa kunja kwa okosijeni ndi chithandizo cha galvanizing. Chithandizo cha Zinc/Nickel chimapezeka mukapempha ntchito makamaka zokhala ndi zowononga.