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                Valve test requirements

                2015/11/5??????view:
                This standard (JB/T9092) is the ZBJ16006-90 "valve test and inspection". This standard is compared with ZBJ16006-90, the main technical content of the differences are as follows:
                The standard name is changed to "the test requirement of the valve"
                Add the term "one-way seal and double seal"
                Valve "must test", according to the nominal pressure and nominal each size has respectively, respectively
                Valve and valve test items are required for the project
                Butterfly valve shell test and seal test of the shortest duration was modified, and other valves
                The shortest duration of the valve seal test was modified
                The maximum allowable leakage of the sealing test was modified according to the requirement of API598-96.
                Test method for low pressure seal test is modified.
                Range
                This standard provides for the test and pressure test of the valve.
                This standard applies to metal sealing vice, elastic sealing vice and non metal seal vice (such as ceramic) of the gate valve, globe valve, plug valve, ball valve, check valve and butterfly valve test and pressure test. After both the supply and demand of the two sides agreed to other types of valve.
                Elastic sealing pair is the:
                A seal, such as oil seal, of a pair of soft seal, solid, and semi solid grease.
                Sealing pairs of non metallic and metallic materials
                Reference standard
                The provisions of the following criteria are contained in the provisions of this standard by reference to this standard. When this standard is published, the versions are valid / all standards will be revised, and the use of this standard shall be subject to the possibility of using the latest version of the following criteria.
                JB/T7927-1999 valve cast steel parts quality requirements
                The term
                One way seal: after the valve is closed, the media must be from both ends of the valve into the valve, the sealing of the valve to maintain the seal
                Double seal: regardless of the direction from the valve ends of the valve, the valve is closed, the valve seal can be kept sealed
                Valve test requirements
                In the valve manufacturing factory inspection of the buyer in the purchase contract provisions, in the factory test valve, inspector of the buyer in order valve manufacturing period, at any time to enter the factory inspection
                Manufacturing in the valve manufacturing factory inspection as specified by the purchaser, inspection, including the valve manufacturing plant outside the shell components, these components should be in the original factory were tested by the buyer's inspector
                Inspection shall be notified by the buyer's request for inspection, the valve manufacturer shall, in accordance with the requirements of the pilot project, 7 days prior to the inspection, the buyer shall notify the buyer by the address of the order. If the request is outside the valve manufacturer, the manufacturer should inform the buyer 7 days in advance.
                The inspection scope shall be limited to the buyer's inspection of any other additional items in the order of the contract.
                1, according to the order of the contract, the use of non destructive testing tools and methods, in the assembly process to check the valve
                2, "must" and "optional" pressure test
                3, review processing and non destructive inspection records (including the provision of radiographic inspection records)
                Note: all tests shall be carried out in accordance with the written procedures of the corresponding standards.
                Inspection 1, valve manufacturing plant to deal with all the valve, valve cover and sealing parts of the castings to check, to ensure compliance with the provisions of JB/T7929
                2, valve manufacturing plant to meet the requirements of each valve to ensure compliance with this standard and related product standards
                Supplementary test other supplemental inspection is carried out only when ordering the provisions of the contract, the specific requirements according to the seller and the buyer agreed procedures and requirements, inspection shall be at buyer's inspector witnessed by the manufacturing factory of valve pressure test requirements
                Test site pressure test shall be carried out in the valve manufacturer by the valve manufacturer
                Test equipment used to carry out the pressure test equipment, test should not be applied to influence the valve seat sealing force
                Test requirements 1, each valve should be in accordance with the "Table 1" or "Table 2" for the pressure test
                2, nominal diameter less than or equal to 100mm, nominal pressure is less than or equal to 25.0MPa and nominal diameter greater than or equal to 125mm, nominal pressure less than 10.0Mpa of the valve should be in Table 1
                3, nominal diameter less than or equal to 100mm, nominal pressure greater than 25.0Mpa and nominal diameter greater than or equal to 125mm, nominal pressure greater than 10.0Mpa of the valve should be based on table 2, table 1
                Test project valve type
                Gate valve globe valve plug valve floating ball valve and fixed ball valve
                The housing must must be must
                The upper seal (1) does not apply to the application of not suitable for application shall not apply
                Low pressure seal must be (2) optional (3) must be
                High pressure seal (4) (5) must () must be optional (2).
                (1) all valves having a seal performance shall be sealed with the seal, except for the bellows seal valves
                (2) for the oil seal type plug valve, the high pressure seal test is a must, and the low pressure seal test
                (3) if the buyer's consent, the valve manufacturer can be replaced by low-pressure seal test pressure seal test
                (4) the sealing performance of the valve may be reduced to the sealing performance of the valve under low pressure
                (5) for a power driven stop valve, the test pressure of the high pressure seal test shall be the 110% "Table 2" of the design pressure used by the selected power drive device.
                Test project valve type
                Gate valve globe valve plug valve floating ball valve and fixed ball valve
                The housing must must be must
                The upper seal (1) does not apply to the application of not suitable for application shall not apply