Speed ​​control valve of the three common troubleshooting tips

April 03, 2023

Common faults governor flow control failure, flow instability and increased leakage within the three categories, here is a brief introduction to the three troubleshooting methods for reference. (A) of the flow control failure This refers to the adjustment of the throttling part of the oil chamber flow does not change, the main reason is the valve core radial jamming and throttling regulation part of the failure. When the pressure reducing spool or throttle spool is in the fully closed position, radial jamming will cause no flow in the oil chamber. When the valve is fully open (or the throttle is well adjusted), radial jamming will cause adjustment throttling Adjust the part of the oil chamber flow does not change. In addition, when the throttle adjustment section fails, will make the adjustment screw can not move axially, so that the oil chamber flow does not change. Occurred in the spool stuck or throttling regulation failure, should be cleaned and repaired. (B) of the flow is not stable decompression throttle valve When the throttle adjust the lock, and sometimes there will be unstable flow phenomenon, especially in the minimum steady flow more easily occur. The main reason is the locking device is loose, throttle part of the block, the oil temperature rise, into the oil chamber minimum pressure is too low and into the oil chamber and so on. Reverse flow through the QF-type governor valve, the pressure reducing valve on the throttle valve does not play a role in pressure compensation, the governor valve into a throttle valve. Therefore, when the inlet and outlet oil pressure changes, the flow through will change, causing the flow instability. Therefore, when used to pay attention to the location of the oil chamber to avoid reverse. (C) of the increase in leakage Decompression throttle valve throttle closed, it is sealed by the gap, it is inevitable a certain amount of leakage, it can not be used as a stop valve. When the sealing surface (decompression valve core, throttle valve and one-way valve core sealing surface, etc.) wear too much, it will cause increased internal leakage, the flow instability, in particular, will affect the minimum steady flow. This article Keywords: speed control valve

Sheet Metal Fabrication Service

Processing steps For Sheet Metal Parts - Custom Sheet Metal Fabrication Service Company
1. Design and draw the part drawing of its sheet metal parts, also known as three views. Its function is to express the structure of its sheet metal parts by means of drawings.

2. Draw an unfolded drawing. That is, unfold a part with a complicated structure into a flat piece.

3. Unloading. There are many ways to unload, mainly the following methods:

a. Shearing machine cuts the material. It uses the shearing machine to cut out the length and width dimensions of the expanded drawing. If there are punching and corner cutting, then the punching machine is combined with the die to punch and corner to form.
b. Punch blanking. It is the use of a punch to punch the structure of the flat part after the parts are unfolded on the plate in one or more steps. Its advantages are short labor hours, high efficiency, and can reduce processing costs. It is often used in mass production.
c. NC CNC blanking. When NC blanking, you must first write a Cnc Machining program. That is, use the programming software to write the drawn expanded diagram into a program that can be recognized by the NC CNC machining machine. Let it follow these programs step by step on a piece of iron plate On the top,punch out the structural shape of its flat parts.
d. Laser cutting is the use of laser cutting to cut the structure and shape of the flat piece on an iron plate.
4. Flanging and tapping. Flanging is also called hole extraction, which is to draw a slightly larger hole on a smaller base hole, and then tap the hole. This can increase its strength and avoid slippage. Generally used for sheet metal processing with relatively thin plate thickness. When the plate thickness is large, such as the plate thickness of 2.0, 2.5, etc., we can tap directly without flanging.

5. Punch processing. Generally, punch processing includes punching and cutting corners, punching blanking, punching convex hull, punching and tearing, punching and other processing methods to achieve processing purposes. Its processing requires corresponding molds to complete the operation. There are convex molds for punching convex hulls, and tearing forming molds for punching and tearing.

6. Pressure riveting. As far as our factory is concerned, pressure riveting studs, pressure riveting nuts, pressure riveting screws, etc. are often used. The pressure riveting method is generally completed by a punch or hydraulic pressure riveting machine. Riveted to the sheet metal part.

7. Bending. Bending is to fold 2D flat parts into 3D parts. Its processing requires a folding bed and corresponding bending molds to complete the operation. It also has a certain bending sequence, and the principle is to make the next cut The first fold that does not cause interference will produce the interference back fold.
8. Welding. Welding is the group welding of multiple parts together to achieve the purpose of processing or the edge welding of a single part to increase its strength. The processing parties generally include the following: CO2 gas shielded welding, argon arc welding, Spot welding, robot welding, etc. The selection of these welding methods is based on actual requirements and materials. Generally speaking, CO2 gas shielded welding is used for iron plate welding; argon arc welding is used for aluminum plate welding; robot welding is mainly in-material It is used when the parts are large and the welding seam is long. Such as cabinet welding, robot welding can be used, which can save a lot of tasks and improve work efficiency and welding quality.

9. Surface treatment. Surface treatment generally includes phosphating film, electroplating colorful zinc, chromate, baking varnish, oxidation, etc. Phosphating film is generally used for cold-rolled plates and electrolytic plates, and its function is mainly to plate on the surface of the material. A protective film is applied to prevent oxidation; the second is to enhance the adhesion of its baking paint. Electroplated multicolored zinc is generally treated with cold-rolled plate surface treatment; chromate and oxidation are generally used for surface treatment of aluminum plates and aluminum profiles; its specific surface The choice of treatment method is based on the customer's requirements.

10. Assembly. The so-called assembly is to group multiple parts or components together in a certain way to make them into a complete material. One thing that needs to be paid attention to is the protection of the materials, and no scratches. Assembly is the last step in the completion of a material. If the material cannot be used due to scratches, it needs to be reworked and reworked, which will waste a lot of processing man-hours and increase The cost of the item. So pay special attention to the protection of the item.

Cnc Sheet Metal FabricationCustom Sheet Metal Folding CompanySheet Metal Prototype FabricationCnc Sheet Metal FabricationMetal Sheet Fabrication Near MeCustom Metal Stamping

Sheet Metal Fabrication Service,Galvanized Sheet Fabrication Service,Custom Machining Service ,Cnc Stainless Steel Machining

Ningbo Rongna Technology Co.,Ltd , https://www.machiningcustom.com