Plastic sub-catchment and the valve device works in the application of warm (c)

1.2.3 plastic filter design requirements



Should be consistent with the use of design-level thickness and hydrostatic test requirements.



1.3 Short-term performance requirements



1.3.1 plastics are the requirements for sub-catchment



Plastic pipe shall meet the corresponding trunk line pipe tube hydrostatic strength.



1.3.2 the requirements of plastic valves



Short-term performance standards in the product factory inspections are mainly done pilot seat and valve sealing the sealed test, used to check the sealing performance of plastic valves, plastic valves that request can not be within the leakage (valve seat leakage ) phenomenon, we can not have outside leakage (valve leakage) phenomenon. Heating Network



Seat of the valve sealing test is to verify the performance of the piping system isolation; valve sealing test is to verify that the valve stem seals and the valve sealing end of the connection of the leakage Department.



Note: 1) products in accordance with the relevant provisions of torque switch valve;



2) The minimum test pressure of 0.05MPa;



3) the maximum test pressure (PN +0.5) MPa;



4) Nominal valve size DN ≤ 200: Test time for at least 15s, DN ≥ 250: Test time for at least 30s;



5) Nominal valve size DN ≤ 50: Test of time at least 15s, DN ≥ 65: Test time for at least 30s.



Test Method: According to GB/T6111-2003 "fluid resistant thermoplastic plastic pipe pressure test method" provisions. Do experiments with the valve seat seal valve clearance should be at a state-wide; to do the pilot valve should be sealed so that the location of valves in the full or semi-open position (such as ball valve), fluid can be semi-open access to stem sealing position. Sealed for a one-way valves, the valve seat in one direction only sealed test; and sealed a two-way valves, the valve seat is sealed in both directions need to do tests.



Net emission test requirements of the air valve in the sample, test pressure gradually increased, 30s up to the required pressure inside the heating heating network.



It should be noted that during the pilot test device can not generate additional stress valve.



Abroad, some companies can not use compressed gas to stress on the plastic valve pressure test done, because different media. 

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