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By certification 
DESCRIPTION
Fixed-setting, 3-port Counter Balance Valves with pilot assist function similarly to the adjustable versions except the fixed setting is pre-set to a nominal value.
OPERATION
The check valve allows free flow from the directional valve (port ② ) to the load (port ① ) while a direct-acting, pilot-assisted relief valve controls flow from port ① to port ② .
Pilot assist at port ③ lowers the effective setting of the relief valve at a rate determined by the pilot ratio.
FEATURES
Counter Balance Valves should be set at least 1.3 times the maximum load induced pressure.
Back pressure at port ② adds to the effective relief setting at a ratio of ① plus the pilot ratio times the back pressure.
Reseat exceeds 85% of set pressure when valve is standard set.
Settings lower than the standard pressure may result in lower reseat percentage.
Zhejiang Huayi Machinery Co., Ltd. in order to "create value for customers, to enable enterprises to sustainable development" for the mission, adhering to the "professional, efficient, win-win," the core concept and the "entrepreneurship, creativity, innovation" business philosophy, to become internationally competitive precision manufacturing enterprises.
Competitive advantage ：Precision metal parts manufacturing leading in China With high precision machining, testing, testing equipment, is committed to providing first-class products. low cost manufacturing，Professional R & D team and after-sales service.
http://www.dahydraulics-valves.com/
