3 inch long stem pressure seal gate valve
Leakage reasons and troubleshooting methods of the sealing ring of the pressure seal valve: 1, the cover and the sealing ring between the incomplete: foreign body clamping, sealing surface corrosion and erosion. Note: the self-sealing ring is made of soft nickel alloy steel and should be handled with great care. 2, pressure seal valve spool and gasket of the pressure seal gate valve between the seal is incomplete: due to corrosion and erosion caused by the surface defects of the valve body wall, the loss of circle, or sealing surface of metal failure such as surface cracks or wounds or uneven metal, may lead to incomplete sealing between the spool and the self-sealing ring. These faults may represent deep cracks in the casting material acting as by-passes in the sealing ring. Torque wrenches should be used to tighten the studs of the bonnet retainer, which can pressure the self-sealing ring. These fasteners are too tight for stress testing during factory manufacture. The following steps are recommended on site: tighten bonnet retainer fasteners at all times to prevent leakage; When removing the valve for any reason, tighten the bonnet retaining bolt again with pressure; All fasteners must be well lubricated to use these values for proper preloading. If the leakage cannot be stopped after tightening, the system shall be re-isolated and disassembled for inspection (note: the pressure seal gate valve shall be replaced with the self-sealing ring regardless of the cause of failure).
Structure of the 3 inch long stem pressure seal gate valve
|2||Three “O” type seal ring|
|3||Precision machined stainless steel valve stem|
|4||High performance rubber and the latest vulcanization technology are adopted inside and outside|
|6||Non-toxic epoxy resin coating|
Features of the 3 inch long stem pressure seal gate valve:
1.The whole package rubber valve core, the valve core for the ductile iron skeleton,High performance rubber and the latest vulcanization technology are used to cover the inner and outer parts,It has excellent sealing elasticity to achieve zero leakage.
2.It adopts three “O” type seal ring design, which has tight sealing, greatly reduced frictional resistance and environmental protection and sanitation. It can also replace the “O” type apron with pressure without stopping water.
3.Corrosion resistant, the inner and outer surfaces of the valve are coated with epoxy resin, and the inner parts are made of stainless steel and copper alloy to prevent rust and fluid corrosion. Can be directly used in domestic water, medicine and other industries.
|Main parts list of the 3 inch long stem pressure seal gate valve|
|Valve body bonnet||Ductile cast iron|
|Bonnet seal||NBR or EPDM rubber|
|Valve plate||Ductile iron coated with EPDM or NBR|
|Screw nut||Copper alloy, brass, ductile iron|
|Main Parameters of the 3 inch long stem pressure seal gate valve|
|PN Mpa||1.0 Mpa||1.6Mpa|
Main external and connecting dimensions of the 3 inch long stem pressure seal gate valve