أنواع الفشل

Valve damage occurs due to following reasons;

Faulty Valve Installation
Incorrect installation of the proper valve
Drive a vehicle faulty
Manufacturing defect of valve

1. Faulty Valve Installation

An engine valve or accessory to an improper reasons described below is installed incorrectly can caused damage. Similar size with original part, is not sufficient for installation.
Incorrect Marking
Incorrect package
Similar Size
Different brand
Unconscious selection

2. Incorrect installation of the proper valve

Due to the installation without considering installation instractions valve may be damaged.
Incompatibility of the piston and valve settings.
Valve - Guide gap incompatibility.
Guide Reaming and driving method errors.
Valve axis misalignment on seat and guide.
Incorrect Marking.
Adjust the surface of valve such as grinding and grinding up.

3. Drive a vehicle faulty

Driver's negligences, ignorances may result from damage to the valve is in this group.
Neglect of vehicle maintenance.
Arm-twisting of the engine and can not be done adequate cooling.
Using poor fuel
Uncertified use of LPG or performance enhancing additives.

4. Manufacturing defects of valve

Dimensional errors. 
Linearity, and a circular seal adjusted deviations. 
Coating loss, roughness, impact, surface defects such as notches. 
Non-compliance in heat treatment.
Material errors.

Winding the guide to valve

1 During the assembly of the valve assembly to comply with the terms.
2 Not using guide sitable casting.
3 Valve - Guide space to comply with the terms installation instructions.
4 Chrome-plated and non-compliance of the valve stem surface roughness height.
5 Vehicles' lack of lubrication.
6 Poor fuel use, and intensification of the smut into gayd.
7 High temperature.
8 Cover of the water channel to be closed.
9 Attention to cleanness the cylinder head.
Due to the aboved reasons, the gap between the valve-gayd wear out the parts causes the compression of the valve. In this phase, the piston which can not normally move, hit the valve and compel the breakage from a nail or neck region.

 

Piston Shock to Valve

There is a synchronized motion between valve and piston. In the position closest to the valve piston valves are closed. However not well done valve settings, deterioration in the engine during operation or valve-piston unsynchronized end up with stroke of the valve. This situation caused to get rid of nails or neck of the valve causes the break.

Combustion or breaks in the valves

The combustion and refraction on the angles of valve arised because of seat - valve assembly from the incompatibilities or as a result of wear in the seat in time for reason not to push angle of valve.

Valve to get rid of Nail

During the installation using the proper nail and the nails to be conducted in accordance with the heat treatment is very important. As a result of the above conditions which are not suitable nails which holds the valve get rid of the nail as this result, the piston toward detachment from guides hangs and damages from piston, such as blows to break.

Breakdown of the valves from welding part

Breakdown on the welded parts of the valves is manufacturing fault which show us welded operation was not done perfectly. In this area not good adhere the welding, During the straightening or grinding processes occured craked or like a structural defect not taken well to stress caused breakage from welding area.

Combustion or smut in the valve

Failure of valve damage occured because of user misuse, using poor fuel, neglect of periodic maintenance. This neglects caused of damages like institutions of the valve, the valve in the form of burning or damage like guide winding leads.

Erosion of the valve stem end

Abrasion on the valve stem end due to the rocker and spring tension occured abrassion on the stem ends of the valve över time. High rocker hardness, valve1 stem end's compliance of hardness and the depth or excessive spring tension caused this vvear's arised untimely.

Break off the valve from nail

Valves hold in the engine through nails. The smallest cross-section area of the nail holes of the valves. These parts are tough than the other parts of valve because required high traction and high abrasion resistance. Cracks vvhich may occure during the heat treatment or high-voltage structure, during metal cutting, high vibration in the valve during operation or high spring tension create this breakage.

The wear of the valve angle

On the angels of valves arised damage called deflation because of heterogeneous wear vvhich reduce the vehicle's performance. Incompatibility of betvveen valve or seat vvhich is in contact with the valve , if these two parts not stay as provide impermeability or high spring tension may cause problem.