about
Graphite washer
The installation steps of are as follows:
adopt
flanged connection
Structure or
threaded connection
Structure,
gasket
After inspection, there is no doubt that other valve parts
Excellent and non-destructive
In the case of ...
1. Before installing gasket and sealing, apply a layer on the rotating parts of gasket, thread and bolt.
graphite powder
Or the oozing lubricant mixed with graphite powder and engine oil (or water), and the gasket and graphite shall be kept clean.
2. The gasket shall be installed on the sealing surface straight and correctly, and shall not deviate, extend into the valve cavity or rest on the shoulder.
3. Only one gasket is allowed to be installed, and two or more gaskets are not allowed to be installed between sealing surfaces to eliminate the gap between sealing surfaces.
4.
Oval washer
Sealing should make the inner and outer rings of the gasket contact, and both ends of the gasket should not contact the bottom of the tank.
5. When installing the O-ring, besides the ring and groove, the compression should be appropriate. On the premise of ensuring sealing,
compression deformation
Speed crossing
a 29-days month of the lunar calendar
Ok, it can prolong the life of O-ring.
6. Before covering the gasket, the valve should be in the open position, so as not to affect the installation and damage the valve parts. Align the position when covering, and don't push the contact gasket to avoid displacement and wear of the gasket.
7.
Bolted or threaded gaskets shall be installed in a horizontal position (threaded gasket covers shall not be used with wrench positions.
monkey wrench
)。
8. Before the gasket is compressed,
Coping with stress
, temperature, the nature of the medium, gasket material characteristics are clearly connected and determined.
pretightening force
, the pre-tightening force should be guaranteed in
pressure test
In the case of no leakage, minimize it.
9. Washer
quickly
After the connection, there should be a pre-tightening gap. In case the gasket leaks, there is still room for pre-tightening.
10. When working at high temperature, bolts will be produced.
High temperature creep
, produce
stress relaxation
, the deformation increases, resulting in leakage at the gasket, which requires thermal fastening; On the contrary, under the condition of low temperature, the bolt will shrink, which requires
Leng Song
1 1. The sealing surface is liquid.
Gasket seal
, sealing surface should be cleaned or surface treated. The plane sealing surface should be polished and matched, and the adhesive should be evenly applied to eliminate air as much as possible. The adhesive layer is generally 0. 1-0.2 mm.
12.
For threaded seals, use
Teflon film
Blank zone
, you should start with the film and paste it in.
Threaded cotton
And then the starting point.
Residual point
Remove the adhesive tape to make the film stick to the thread wedge.