Hydraulic support is support equipment of mine fully mechanized working face, mainly supporting coal mining roof, maintaining the safety work space, and advancing working face transport equipment. The original large mining height ZZ9900 support was no longer needed, ZZS6000 shield support was adopted, in order to reduce the cost, operating valve DHC3/ZCFD4 of ZZ9900 support was transformed, with performance comparison. The result showed the operation valve with good performance and economic benefit.