GB 7934-87 Technical conditions for two-way cartridge hydraulic valves

GB/T 7934-87 Two-way plug-in type hydraulic valve Technical Condition Introduction To meet the needs of modern industrial production, there are many kinds of hydraulic valves with different working principles.GB/T 7934-87 two-way plug-in type hydraulic valve is a kind of valves with simple structure and reliable performance, which belongs to motion control products used in oil hydraulic circuit. This standard is applicable to the design and manufacture of two-way plug-in type hydraulic valves. This standard does not apply to other types of hydraulic valves. The purpose of this standard is to ensure safe and reliable operation of the valve. Main Content GB/T 7934-87 two-way plug-in type hydraulic valve is divided into two series according to the pressure rating: namely, general-purpose and high-pressure series. The pressure range of the general-purpose type ranges from 0.2MPa ?MPa, and that of the high-pressure type ranges from 0.5MPa ?MPa. The size of two-way plug-in type hydraulic valves ranges from 16 ~ 400 (corresponding to the nominal diameter DN 16 ? DN 400 mm).Two-way plug-in type hydraulic valve mainly includes two parts, namely the body part and the valve core part. The two parts are respectively composed of bonnet, valve plate, valve stem and valve seat. The body part of the valve is generally made of casting material, and the valve core part is generally made of forging material. The sealing parts of the connection between them is made of compounded material. Additionally, GB/T 7934-87 two-way plug-in type hydraulic valves are also equipped with regulating parts such as valve positions, pressure compensators and manually operated parts, as well as PC type spool positions and memory type positions. Testing and Inspection According to the national standard GB/T 7934-87, the testing and inspection requirements for two-way plug-in type hydraulic valves include appearance inspection, performance inspection, flow rate test, external leakage test and operation function test, etc.Conclusion GB/T 7934-87 two-way plug-in type hydraulic valves are widely used in oil circuit control. It has simple structure, reliable performance and can meet the requirements of modern industrial production. In order to maintain the safe and reliable performance of two-way plug-in type hydraulic valve, the design and manufacture of the valve should be carried out according to the standard, and proper testing and inspection should be carried out during the manufacturing process.