The valve specifications varieties have dozens of
categories,up of ten thousand. At present, in the industrial facilities
and urban utility facilities used in the valve can be divided
roughly into two categories. Category for industrial instruments
regulating valves, the industrial generic valve.
Industrial generic valve refers to the industrial facilities
and urban utility piping system is widely used in the valve.Use
in industrial valve total usage of 99%. the special valves of
industrial generic valve, have many kinds, such as: pressure reducing
valve, liquid level control valve , temperature control valves,
check valves, steam trap, hydraulic valves, etc.For their use
in industrial generic valve about less than 1%.
The general valve symbol project(GB12220);nominal bore(DN);nominal
pressure(P);pressure parts material code;name of manufacturer
or trademark;the arrow to the flow direction of medium;sealing
ring (pad) code universal valves must use and can choose to use
symbol project£¬below lists. For manual valve size,
if the handwheel is big enough, the handwheel should have indicating
the arrow valve closed or added the words " open "or"
off ".
The general valve symbol project(GB12220);nominal bore(DN);nominal
pressure(PN);pressure parts material code;name of manufacturer
or trademark;the arrow to the flow direction of medium;sealing
ring (pad) code;extreme temperature enti. degree);threaded code;extreme
pressure;manufacturer of numbers;Standard: Heat:internals material
code, location: lining material code, quality and test mark, inspection
personnel mark, manufacturing year, month,flow characteristics
Specfic mark of genneral valve to stipulate as follow:
1,When there are provisions in standard type valves must be used
the mark,they shall be mark separately in the body and flange.
2,For the valve DN>=50mm, marks should be on the body, for
the valveDN<=50mm, mark on the bodyor the plate, by product
designers.
3,If no specific standards of the valve. When needed,can mark
in the body or plate.
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