classification of stainless steel globe valves -凯发彩票

stop valve channel
1. according to the channel direction of the globe valve, divided into:
1) straight-through cut-off valve
2) once-through cut-off valve: in once-through or y-shaped cut-off valve, the valve port and the mainstream way into a diagonal lines, so that the flow state damage than conventional cut-off valve, thus by corresponding small valve pressure loss.
3) angle type globe valve: in the angle type globe valve, the fluid can only be changed in one direction, so that the pressure drop of the valve is smaller than the globe valve of the conventional structure.
4) plunger type globe valves: this type of globe valve is a variation of the regular globe valve.
in this valve, the disc and seat are usually designed based on the plunger principle.
the disc is connected to the stem by a plunger and the seal is realized by two elastic sealing rings on the plunger.
two elastic sealing rings are separated by a ring, and the sealing ring around the plunger is pressed by the loading of the cover nut on the cover.
elastic sealing ring can be replaced, can use a variety of materials, the valve is mainly used in the "on" or "off", but with a special form of plunger or special thimble, can also be used to adjust flow.
position of thread
2. according to the position of thread on the globe valve stem:
1) screw stem globe valve: the thread of the globe valve stem is outside of the valve body.
its advantage is that the stem is free of dielectric erosion and easy to lubricate. this kind of structure is more common.
2) screw stem globe valve: thread of globe valve stem is in body.
this kind of structural stem thread contact with the medium is easy to be eroded and cannot be lubricated.
this structure is used for small bore and low temperature.
domestic categories:
domestic production cut-off valve manufacturers are more, the connection size is also mostly ununified.
the main categories are:
1) universal class based on jb/t2203-1999 "cut-off valve structure length".
at present domestic most of the cut-off valve manufacturers are produced according to this standard, but this standard is not perfect, the specification is not complete, single ram valve nominal diameter as the largest 48 "), double ram dn1500 cut-off valve maximum nominal size.
according to the specifications and information of the cut-off valves produced by the factory, the current nominal size of the angle stop valve is dn15, and the nominal diameter of z-type straight-through valve is dn2000.
in order to have a uniform standard, the same specification can be exchanged in the selection and installation of the user. it is recommended that the china general machinery research institute (gge) revise the "cut-off valve structure length" of jb/t2203-1999.
it is recommended that the design institute and the user press the standard, the cut-off valve manufacturer is designed and manufactured according to the standard.