Y-Strainer is necessary equipment for pipeline systems, generally installed in the entrance of pressure-relief valve, pressure-release valve, water-positioner valve or other equipments, to protect the valves and equipments by clearing the impurity in medium. This strainer has feather of advanced structure, little resistance, efficient pollution-discharging, can be used in water, oil and gas, and generally mesh amount is 18~30 for water passing, 40~480 for gas passing, customization will be accepted.