Shuangda Hydraulic Machinery is one of the professional remote controlled relief valve manufacturers and suppliers in China,Website:://.chinahydraulic-valve.com, welcome to buy cheap and low price remote pressure adjusting valve made in China from our factory. Usage and characteristic Y/YF Remote control relief valve is a mini direct-action relief valve. It can connect to the remote-control port of relief valve so that to remotely control the pressure of the main relief valve in a set adjusting range. This range can be set differently by changing the adjusting spring of the remote pressure adjusting valve.