XG808 Pilot solenoid valve Shagong Excavator solenoid valve spool 16mm excavator part SV38-30

All kinds of threaded cartridge valves: structure, working principle and performance

First, the basic performance requirements for hydraulic valves:
① Sensitive and reliable action, stable work, small impact and vibration;
The pressure loss is small when the oil flows through;
③ Good sealing performance, small internal leakage;
④ Simple and compact structure, easy installation, debugging and maintenance of good versatility.
Second, the valve connection mode:
Threaded connection: The valve body has internal or external threads and is connected with pipe threads.
Flange connection: The valve body has a flange and is connected with the pipe flange.
Welded connection: Valve body with welded groove, welded connection with pipe.
Clamp connection: The valve body has a clamp and is connected to the pipe clamp.
Sleeve connection: The valve is connected with the pipe by the sleeve
Clamping connection: The connection form of directly clamping the valve and two pipes together with bolts.

Cartridge valves can be divided into two types of installation: Slip-in and Screw-in

Class. The slip-in type is usually called a two-way cartridge valve or logic element, which generally requires additional pilot control valves to work

Do. The screw type is the threaded cartridge valve described in this article, which can generally complete one or more independently (after loading the mounting hole)

Hydraulic functions, such as relief valve, electromagnetic direction valve, flow control valve, balance valve, etc.

Solenoid valve is an industrial equipment controlled by electromagnetic, is used to control the automatic basic components of fluid, with external leakage blocked, easy control of internal leakage, safe use; Simple structure, low price, easy to install and maintain; Fast action, small power, lightweight appearance; Various models, wide range of uses and so on. There are some problems with the solenoid valve. Let's take a good look at the common faults of the solenoid valve.

1, coil short circuit or break

Detection method: First use a multimeter to measure its on-off, resistance value approaches zero or infinity, indicating that the coil short circuit or open circuit. If the resistance value can be measured normally (probably tens of euros in China), it can not show that the coil problem is good. Please analyze the following problems and finally pass the test: Find a small screwdriver and put it near the metal rod in the solenoid valve control coil, and then energize the solenoid valve, if we feel magnetic, then a solenoid valve working coil is good, scraping is bad.
Solution: Replace the solenoid valve coil.

2, plug/socket problem

Fault phenomenon: If the solenoid valve is the kind of plug/socket, there may be a metal spring problem of the socket (the author has encountered), the wiring problem on the plug (such as the power cord connected to the ground wire) and other reasons can not send the power to the coil. It is best to form a habit: after plugging in the socket
Fixed screw, coil in the spool stem behind the fixed nut nail.