What is the method of hinging a valve seat?

The function of the door seat is to seal the cylinder by the close fit between its inner cone and the valve head cone and accept the heat from the valve. The valve seat can be bored directly on the cylinder head. The temperature of the valve seat is high.

When the engine is working, the valve seat is subjected to high temperature and the impact of the valve seat, and there are often faults such as ablation of the working cone, widening or disconnection of the contact ring with the valve, which can generally be repaired by reaming and grinding. The reaming of the valve seat is usually done by hand with a valve seat reamer. The valve seat reamer is composed of multiple reamers of different diameters and different taper angles.

The valve seat should generally be rough hinged first and then finely hinged, and the reaming method is as follows: before repairing the valve seat, the valve guide should be checked, and if it does not meet the requirements, the valve guide should be replaced or repaired first, so as to ensure that the center line of the valve seat and the valve guide coincide. Select a suitable set of valve seat reamers according to the diameter of the valve head and the angle of each cone of the valve seat.

Select the appropriate valve seat reamer rod according to the inner diameter of the valve guide, and the reamer rod inserted into the valve guide should rotate flexibly and not loosely. First, the working cone of the valve seat is machined with a rough reamer of 45° (or 30°). When reaming, hold the handle vertically and downward with both hands, and only rotate in a clockwise direction, and it is not allowed to reverse or only rotate in a small area.

Until the working cone of the valve seat is fully exposed with a metallic sheen. Then use the repaired valve or the new valve for trial matching, and reaming correction according to the position and width of the contact ring belt on the valve seal cone. If the contact ring belt is biased towards the valve stem, the reamer should be corrected by 75°; If the contact ring belt is deflected towards the top of the valve, a 15° reamer correction should be applied.

The width of the hinged valve seat working surface should be in accordance with the regulations, and the contact ring belt should be at the position of the top of the valve deviation valve in the middle of the valve sealing cone. Finally, use a 45° fine reamer to reamer the valve seat to work the cone, and padding a fine abrasive cloth under the reamer for grinding. <>

The valve seat should generally be rough and then finely hinged, and the specific methods are as follows: before repairing the valve seat, the valve guide should be checked, and if it does not meet the requirements, the valve guide should be replaced or repaired first, so as to ensure that the center line of the valve seat and the valve guide coincide; Select a suitable set of valve seat reamers according to the diameter of the valve head and the angle of each cone of the valve seat. Select the appropriate valve reamer rod according to the inner diameter of the valve guide, and the reamer rod should rotate flexibly and not loosely when inserted into the valve guide; After the valve seat is reamed, a little abrasive sand should be coated between the valve and the valve seat for grinding to ensure the tightness of the valve and the valve seat; Finally, check the tightness of the valve and the valve seat, use the marking method to check, use a soft pencil of more than 2b to draw a vertical line every 10mm on the valve sealing cone, load the valve into the valve guide, press the valve and the valve seat by hand and rotate it back and forth for 1 4 turns, remove the valve for inspection, if all the lines are cut off, it means that the valve and the valve seat are well sealed.

1. Use a 45° reamer to hinge out a 45° valve round surface on the valve seat, and install and take down the valve many times when hinging the pin to calibrate the sinking amount of the valve until it meets the requirements.

2. Insert the valve into the catheter and gently tap a few times to see if the traces of the seat line printed on the valve mount are in the middle of the valve disc mounting, and if it is on the upper side, use a 15-degree reamer to reamer the valve seat upper mouth line.

3. Use a 45-degree reamer to gently reamer the pin 2 3 times to correct the seat line.

When using, you should handle it gently, pay attention to the blade, rotate clockwise and reverse when hinging the door, and rotate smoothly and do not jump the knife.

The diameter is available, pay attention to the angle of 30 degrees and 45 degrees, the old seat ring should be narrowed with 45 degrees, and then flattened with 30 degrees.

Valve seat maintenance method:

1. First of all, select the reamer according to the valve, and hinge the cone on the seat.

2. Use 45° (exhaust valve seat) and 55° (intake valve seat) reamers to correct the valve gate to make the valve transition smooth to reduce the intake resistance. Correction of the width of the valve sealing belt; The intake valve is about 1 52mm and the exhaust valve is about 1 42mm.

3. Use the test method to check the contact situation and position of the sealing belt. Use the valve test (apply a little red oil on the valve cone), press it on the valve seat and rotate it several times, take it out and observe, the valve valve cone and the valve seat sealing belt should be in good contact, and the position should be 1 3 places below the cone to ensure that the valve head has sufficient rigidity. The contact surface on the valve automatically moves upwards as time increases.

4. Check the quality of repair. The hinged valve seat is measured with a special measuring tool according to the technical requirements: if the misalignment between the seat cone and the catheter is greater than 0 03-0 05mm, it should be re-corrected until it meets the standard, and it must not be tried to save trouble. Be sure to pay attention when repairing.

Insert the guide rod of the valve seat reamer into the valve sleeve, press down firmly and turn the reamer after the blade is in contact with the valve seat.

The operating procedure of the valve seat reaming step is as follows:1According to the inner diameter of the catheter, select the appropriate rotten reamer guide rod and insert it into the valve guide, and adjust the guide rod to make it fit closely with the surface of the inner hole of the valve guide.

2.There is a hardened layer on the surface of the valve seat, which will make the reamer slip when reaming, in this case, a coarse abrasive cloth can be used to pad the reamer under the reamer for sanding, and then reaming is carried out after sanding.

3.A 30' or 45' reamer is applied to the guide rod and then reamed. When reaming, the reamer should be straight, the force of both hands should be balanced, and the reaming should be carried out in a clockwise direction until the defects such as ablation and spots are reamed.

4.Remove the reamer and guide rod and test match the valve seat with a new valve or a polished valve, requiring the contact surface ring width to be millimeters and in the middle and lower part of the valve cone.

5.If the ring belt of the contact surface is biased, it should be reamed with a 150 reamer to move the ring belt downward; If the contact ring belt is off, use a 75' reamer to reaming to move the ring belt up until it meets the requirements.

6.On the 30 or 450 reamer, a fine abrasive cloth is placed on the reamer to repair the valve working surface again to improve the finish of the contact surface.

7.Check the valve sink again.

1.Check that the valve guide is not loose. Suspected.

2.According to the inner diameter of the conduit, select the suitable tool holder for the conduit, and select the appropriate cutter head according to the outer diameter of the valve seat.

3.Place coarse sandpaper under the hinge of the working surface to remove the hardfacing layer.

4.Use the working face reamer 45 degrees, or 30 degrees, reaming the working face, and the working face width of the straight valve seat meets the requirements.

5.Use a 75-degree cutter head to hinge the mouth, and use a 15-degree cutter head to lower the mouth.

1. Use a 45° reamer to hinge out a 45° valve gate round surface on the valve seat, and install and take off the valve many times when hinging the pin, so as to calibrate the sinking amount of the valve until it meets the requirements of the sock car.

2. Insert the valve into the catheter and gently tap it a few times to see if the traces of the seat line printed on the valve mount are in the middle of the valve disc mounting, and if the pure fruit is on the top, use a 15-degree reamer to reamer the valve seat upper line.

3. Use a 45-degree reamer to gently reamer the pin 2 3 times to correct the seat line.

When using, it should be handled gently, pay attention to the blade, rotate clockwise and reverse when hinging the door, and rotate smoothly and do not jump the knife. The diameter is available, pay attention to the angle of 30 degrees and 45 degrees, the old seat ring should be narrowed with 45 degrees first, and then repaired with 30 degrees.

Flat valve seat maintenance square base Zaozhou law:

1. Select the reamer according to the valve, and hinge out the cone rock on the seat;

2. Use 45 degrees and 55 degree reamers to correct the valve gate to make the transition of the air gate smooth, so as to reduce the air intake resistance;

3. Check the contact situation and position of the sealing belt with the test method, use the valve test, put it on the valve seat to press and rotate several times, and observe that the valve valve beats the cone and the valve seat sealing belt in good contact, and the position should be in the lower third of the cone to ensure that the valve head has sufficient rigidity, and the contact surface on the valve will automatically move up with the increase of use time;

4. Check the quality of repair, measure the hinged valve seat with a special measuring tool according to the technical requirements, and if the misalignment between the seat cone and the catheter is greater than to millimeters, it should be re-corrected.

When the engine is working, the valve seat is subjected to the impact of high temperatures, and when the valve is seated. The working cone is often ablated, widened, or the annular belt in contact with the valve is broken. Generally, the sedan can be repaired by reaming and grinding.

Valve seat reaming is usually done by hand with a valve seat reamer. The valve seat reamer consists of several reamers with different diameters and taper angles. Generally, the valve seat should be rough hinged first, and then finely hinged.

The reaming method is as follows: (1) Before repairing the valve seat, check the valve guide. If the requirements are not met, replace or repair the valve guide to ensure that the valve seat coincides with the centerline of the valve guide.

2) According to the diameter of the valve head and the angle of each cone of the valve seat, select a suitable set of valve seat reamers. According to the inner diameter of the valve guide, select the appropriate valve seat reamer bar, and the reamer bar inserted into the valve guide should rotate flexibly without loosening. (3) First, use a 45 (or 30) rough reamer to process the seat working cone until all the metallic luster is exposed.

Note: When reaming, hold the handle with both hands and press down vertically, which can only be rotated clockwise. Reversal or rotation only in a small area is not allowed.

4) Test the repaired valve or new valve, the base sail and reaming correction according to the position and width of the valve sealing cone contact annulus. If the contact annular air is biased towards the valve stem, it should be corrected by using a 75 hole reamer; If the contact ring is biased towards the top of the valve, a 15-gauge reamer should be used to correct it. The width of the working surface of the hinged seat should be as specified, and the contact ring belt should be located in the middle of the valve sealing cone that deviates from the valve top.

5) Finally, use a 45 fine reamer to refine the working cone of the valve seat, and put a fine abrasive cloth under the reamer for grinding.

1 Select the reamer guide.

According to the inner diameter of the valve guide, select the appropriate reamer guide rod and insert it into the valve guide tube to make the guide rod fit the surface of the inner hole of the valve guide.

2 sand-hardened layer.

Due to the hardened layer of the valve seat, the reamer tends to slip when reaming. In this case, a coarse abrasive cloth can be used to sanding under the reamer, and then reaming.

3 Initial hinge. First, put the 45° reamer dust blind (just thick and thin knife depending on the situation) on the guide rod, so that the keyway of the reamer is aligned with the flange of the lower end face of the reamer handle, and then the reaming can be carried out. When reaming, the reamer should be upright, the force of both hands should be uniform and steady, and the reaming should be rotated in a clockwise direction.

If you return the knife counterclockwise, do not use force to prevent the blade from being dulled until the defects such as ablation, spots, and dents on the valve seat are removed.

Generator valve seat reamer.

4. Fitting and trimming contact surfaces.

After the initial hinge, the matching valve should be polished for trial matching. Its trial method.

Yes: Applying red dan to the tapered face of the valve seat.

oil, put the person in the catheter and rotate it 2 3 times (do not shoot), and then take out the valve to observe its contact. The normal requirement is that the contact surface should be in the working slope of the valve.

The middle and lower part, the width of the intake valve is about, the exhaust valve is about, the contact surface is too narrow, which affects the sealing and heat dissipation, and it is easy to accumulate carbon if it is too wide, and it can not be closely matched. The correct position of contact between the valve and the valve seat is shown below (figure). In the middle and lower part of the valve cone working surface, the width is.

After the initial reaming of the trial, if the contact surface is up, the 15 ° reamer should be used to reamer the upper mouth, so that the contact surface is moved down, if the contact surface is down, the 75 ° reamer should be used to reamer the lower mouth, so that the contact surface is moved up, the initial hinge should try to make the valve contact surface in the middle and lower part, should be hinged while the test matching. In order to prolong the service life of the valve seat and valve, the hinging can be stopped when the contact surface is 1 mm away from the lower edge of the valve.

5 Fine hinges. Finally, the reaming (grinding) of the diesel generator is finely repaired with a 45° (or 30°) fine-edged reamer or a fine abrasive cloth on the reamer.

Valve seat working surface to improve the finish of the contact surface.

Finally, it is checked with red dandan, and the contact surface between the valve and the valve seat should be an uninterrupted annular belt.