Globe valve standard and working principle
Cut-off valve works for example, suppose a lid with a water tank, water from the bottom into the cylinder out of the cylinder head is equivalent to the closure of the valve.If the hand lift up the cylinder head, it is equivalent to cut-off The working principle of the valve.If the cylinder head is removed to the side by hand, it is equivalent to the working principle of the gate valve.Main standard: 1, Design standard: GB / T 12235 2, Connection standard: 1) Butt welding end BW: 12224 2) flange end RF: according to JB79; GB / T 9113; HG20592 3, the valve test and test: GB / T 13927; JB / T 9092 the following structure: open rod bracket bolted bonnet; Integral seal seat cover Details: The globe valve opening and closing pieces are cylindrical valve disc, the sealing surface was flat or cone, the valve flap along the centerline of the fluid for linear motion. Stem movement form, lifting rod (stem lift, hand wheel does not lift), there are lifting rotary rod (hand wheel with the stem rotating together, the nut is located in the valve body). Cut-off valve is only suitable for full open and closed, custom made to allow for regulation and throttling. When the valve is open, the valve opening height, 25% to 30% of the nominal diameter, the flow has reached its maximum, indicating that the valve has reached the fully open position. Therefore, the full-stop position of the valve, valve stroke should be determined.
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