Hydraulic valves have a wide range of applications, the previous article, introduced the classification of hydraulic valves and troubleshooting methods, this article will further explain the different connections of hydraulic valves and selection criteria.
1. Hydraulic valves are connected in different ways
Hydraulic valve connection can be divided into four types, tube connection, plate connection, integrated block connection, stacked connection.
(1) Tube connection
Tube connection has the advantage of simple connection, the hydraulic system between the valve oil towards a clear, the disadvantage is that the structure is scattered, accounting for the hydraulic system space is larger, staggered joints, not easy to install and dismantle, maintenance, pipe joints are easy to oil leakage and into the air, but also easy to produce vibration and noise. Currently less used.
(2) Plate connection
Plate connection is the plate hydraulic valves are uniformly installed in the connection plate, the connection plate used in the following forms.
① single-layer connection plate Valve components are installed in front of the vertical connection plate, the valve oil line in the plate after the oil pipe connection. This connection plate is simple, easy to check the oil circuit, but the plate piping, installation and dismantling is not convenient.
② double-layer connection plate between the two plates to connect the valve oil circuit. Two plates and then fixed together with adhesive or screws, simple process, compact structure. But the hydraulic station system pressure is high oil leakage prone to string cavity problems.
③the overall connection plate overall connection plate in a thicker connection plate drilling or casting holes as a connection to the oil circuit, compact structure, fewer tubes, reliable, but the processing is more difficult, the pressure loss of the oil circuit is greater.
(3) Integrated block type connection
Simply put, the integrated block type hydraulic device is the plate hydraulic components installed in the integrated block around the three sides, the other side of the installation of pipe fittings, connected to the hydraulic actuator through the oil pipe. This type of connection has a compact structure. Less tubing, can be standardized, easy to design and manufacture and other advantages. Therefore, it has been widely used in a variety of hydraulic systems.
(4) Stacked connection
Stacked valve type is another way of hydraulic device integration, each stacked valve plays the role of both control valves, and the role of the channel body. Therefore, the stacked valve configuration does not require another connection block, just use long bolts directly to the stacked valve mounted on the base plate block, you can form the required hydraulic system.
2. How to choose the most suitable, the hydraulic valve connection method
Hydraulic valve connection on the structure of the hydraulic device has a decisive impact on the form of hydraulic valve connection should be considered in the choice of the following four factors.
① volume and structure. Hydraulic system operating flow in lOOL/min or less, priority can be given to the selection of stacked valves, which will greatly reduce the number of oil block (or channel body), thus reducing the system volume, weight reduction.
② Price. Realize the same function, the same specifications of different types of valves compared to the lowest price of ordinary hydraulic valves, stacked valves followed.
③Modern hydraulic systems are becoming increasingly complex, usually a hydraulic system often contains many circuits or branches, each branch of the flow rate and working pressure is not the same, the choice of hydraulic valves should be based on the characteristics of the working conditions, a mixture of several types of valves, so as to get the maximization of economic benefits for the performance indicators of the higher requirements of the system in the selection of hydraulic valves in addition to considering the pressure, flow rate of a reasonable match, but also should be the performance indicators of hydraulic valves. Performance indicators have an understanding.
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