the valve is the most used in a fluid system, a control unit can be used to switch or control flow and adjustment etc, and from the simplest truncation function, the valve seal in machinery, its function is to prevent medium, from its place, between the cavity body along parts of the combination of leak outward or block the external material into the interior, the sealing effect, part of the said seals or sealing structure, referred to as 'seal, the two joint surface in contact with the seal, the sealing effect of surface is called the sealing surface.

the valve sealing surface is the core part of the valve, it produces leakage in the form of general can be divided into several, the leakage of the sealing surface, sealing ring joint leakage, shut off the leak and seal face between embedded foreign material leakage. The valve in the pipeline and equipment is one of the most widely used to cut off the medium flow, therefore, its sealing is the main factor of decision making of leakage or not. The valve sealing surface generally consists of a pair of seal, a in the body, another on the disc.

leak sealing surface, its reason is generally has the following several kinds:

a, sealing surface grinding, cannot form a closed line;

two, the joint of the Industrial Valves stem and closing member centers are suspended, incorrect or wear; Three,

stem bending or assembly is not straight, make close a skewed or do not meet;

4, selection of sealing surface material improperly or not according to the working condition valve, sealing surface is prone to corrosion, erosion and abrasion;

5, overlaying welding and heat treatment according to the rules of operation, due to the hard through low wear and tear, corrosion, because of the alloying elements loss due to excessive internal stress defects such as cracks;

6, after surface treatment of sealing surface spalling or grinding is too big, lose the original performance;

7, sealing surface closed lax or shut down for the appearance of the cold thin seam, produce the corrosion phenomenon;

8, the cut-off valve used as throttle valve, relief valve, sealing surface erosion and destruction;

9, the valve has been to the fully closed position note apply too closing force, including not proper use of leverage, long sealing surface crushed, extrusion deformation;

10, sealing surface wear is too large, resulting in drop phenomenon, namely seal cannot be closed well;

the valve sealing surface leakage prevention and elimination method:

a, sealing surface grinding, lapping, abrasives, such as emery cloth sandpaper objects should choose reasonable grinding method to correct, after grinding should be dye check the sealing surface should be no indentation, defects such as cracks, scratches;

2, the valve stem and shut down a joint shall comply with the design requirements, does not conform to the requirements of the centers, should undertake nap, centers should have a certain gap, especially in stem shoulder and close the axial clearance of not less than 2 mm;

three, the valve stem curve should be straightening, valve stem, stem nut, closed, seat after adjustment, they should be in a common axis;

4, choose valve or replace the seal face, should comply with the conditions, after sealing surface processing, its corrosion resistance, resistance and abrasion resistance performance is better;

5, overlaying welding and heat treatment process should be in conformity with the technical requirements of seal face processing procedures and standard should be performed after acceptance does not allow any defect that affects the use exists;

6, sealing surface ping fire, nitriding, the tent, Ming plating process must be strictly according to the codes and specifications, technical requirements of ground sealing surface permeable zone should not be more than 1/3 of a pair of this layer coating and permeable formation damage is serious, should be removed after coating and permeable layer to surface treatment. For high frequency sealing face of the ground surface repeatable and repair of fire.

7, the valve should be closed or open tag, should be timely repair of closed lax. For high temperature valve, some cold after the closing of thin seam, should be in the closed interval after a certain time to shut down more than once;

8, used as cut-off valve valve, don't allow for the use of throttle valve, relief valve, close the pieces should be in the fully open or close position and fruit need to adjust the medium flow rate and pressure, should set the throttle valve and relief valve alone;

9, before the valve open and close valves should comply with the 'operation' section, appropriate valve closing force, the handwheel is less than 320 mm in diameter, only allows one operator, equal to or greater than 320 mm diameter of the handwheel, allowing two people operation, or a person with the aid of leverage within 500 mm;

10, produced water drops, should be adjusted, the unable to adjust the sealing surface of sealing surface should be replaced;

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