1, outlet valve parts wear characteristics of outlet valve wear parts, mainly in the closed cone, and a guide part of the decompression zone.
(1) seal wear characteristics of cone wear big here, so that the valve seat seal ring width increased, decreased smooth finish; in the valve cone appeared ring ditch, the depth of about 0.05 mm.
(2) decompression of the wear characteristics of ring wear is also where large ring worn decompression was tapered, the next big small; cylindrical surface over the grooves, the light under the dark; decompression ring belt under the edge of wear and round.
(3)-oriented surface wear characteristics of here wear less, compared with the lower part of the upper worn big oil in the oil seat seat with a matching decompression zone also wear some guidance.
2, the identification of Valve Assembly
(1) General identification of observation with the naked eye, if the outlet valve parts in one of the following defects can not be used.
① decompression ring with serious signs of wear, milky white axial scratch, scrape with a fingernail or decompression obviously feeling the circumference of the axial ring notch intensive to see when the original surface finish.
② sealed conical wear too much, with too much or seal ring seal ring is in a collapse.
③ the valve and valve seat are corrosion, or metal flaking and deep, when the abrasive notch.
④ the serious corrosion of the oil when the plane seat.
Cone ⑤ the oil seal on the valve seat ring slots marked scar, scrape with a fingernail when there is feeling.
(2) outlet valve sealing simple test cases identified
A simple test ① sealing cone identification Hold the thumb and middle finger out of the oil valve seat, with the index finger pressed to the valve on the valve seat, mouth suction valve seat under the plane of the oil hole, and moved his lips, if be lips suck, indicating good sealing performance. Can also be a valve assembly into pump body, has no plunger, high pressure oil pipe joints from 294-490 kPa compressed air to bond inspection. If leakage, indicating good sealing performance, or to be repaired or replaced with new parts.
② vacuum sealing ring for easy identification of performance tests with the thumb up against the oil holes in the plane seat, will be the release valve seat in accordance with the index finger gently down, when the vacuum valve seat ring into the , the feel of compressed air upward rebound. When you release the index finger, the outlet valve to rise again, says. Ming decompression valve seat ring hole and sealing the oil well, otherwise unqualified.
③ the new outlet valve replacement parts, but also for sliding test. Soaked in diesel fuel in the outlet valve parts out, Hold the valve seat, to keep it in the upright position, then the valve body out of songs about 1 / 3, that is to let go, body should be able to own weight to the seat on the role of fate, then the rotation at any angle valve test, the results should be the same.
3, outlet valve parts valve repair decisions can continue to work out the key parts are sealed cone. Sealing cone slightly worn or loose contact, they can in a sealed conical surface evenly coated with abrasive paste, and then insert the seat in the rotating grinding, grinding several times, then grind in one direction change. Be careful not to grind paste stick vacuum ring belt. Grinding a certain time, washed abrasive paste, and then dipped in diesel fuel each study and the oil valve on the tap in the seat several times. Grinding, clean, then seal performance test. Plunger-type oil pump failure identification and repair