Compression Valves Kitchen Taps. Genuine Kitchen Tap Spare Parts. Taps with Compression Valves are not as common as quarter turn Kitchen Taps these days but they maximise low water pressure situations. So if you have low water pressure coming from the hot water side of your Kitchen Tap then we would recommend fitting a Kitchen Tap that has a Compression valve in it. Compression Tap Valves are operated by twisting on and off and usually the same valve is in both the hot and the cold side of your Kitchen Tap. Ceramic Disc Valves have a different mechanism and turn a quarter turn to turn on or off. Ceramic Disc Valves open anti-clockwise and clock-wise.