... quality. Pneumatic Diaphragm Steam Control Valve(150Lb, 300Lb, 600lb,900Lb,etc) Features:Top-guided Single Seated Control Valves, compact valve body, less component, ... esay to maintain.The mental valve plug is suitable ... more details for you. Pneumatic Diaphragm Steam Control Valve(150Lb, 300Lb, 600lb,900Lb,etc)