Recently, Shanghai Shanghai Special Flow Control Valve Control Valve Co., Ltd. launched labyrinth control valve, the valve design features are as follows:
● Each valve cage with a special welding process will be multi-layer adhesive articles made of the maze, the maze Each piece molding technology using special process into a number similar to the labyrinth flow channel, each flow under different conditions, after a precise calculation, designed a series of specific number of right-angle bend to provide smooth blood pressure medium resistance, limiting medium flow rate in the 30m / s the following, keeping always in the saturated medium pressure above the vaporization pressure, eliminating cavitation, erosion and vibration noise flash and so on;
Each maze designed to be thin films, based on user demand for specific conditions, can be made into custom regulation characteristics of the valve cage, precision control of flow;
● valve cage outer edge of the dense maze entrance of many small, equivalent to the filter, to prevent welding slag and other magazines into the spool and seat position, thereby preventing valve stuck and the sealing surface damage;
● labyrinth film applied to the outlet channel cofferdam structure, so that the pressure evenly around the spool, spool to the stable, the upper and lower exports of medium flow interaction medium on the sealing surface to prevent direct erosion;
● spool, the valve seat contact surface with different angles, to form line contact seal, close the performance is good;
● sealing surface welding stellite alloy, extends valve life.
● In principle, the pressure differential and large size balanced spool valve can be used, reducing the opening force. High temperature and small size unbalanced spool valve can be used to reduce internal leakage. Temperature, pressure differential and large-sized valves can use the structure of pressure-type pilot valve spool, close more tightly, open the small torque.
Occasion for the product are:
The maze can be used in different combinations to meet chip demand different conditions, it can provide a linear, equal percentage, the percentage of correction, and other special forms of regulation performance curves.
Linearity requirements for valves, valve cage is generally used the same combination of maze pieces, all the discs have the same number of flow channel, each channel there are the same level and area of right angle turns. Therefore, the flow control valve opening with the same pressure difference in linear proportion. Pump minimum flow control valves (recycle valve) often used this type of valve, because a large pressure difference, results are quite satisfactory, the general structure by pressure-type pilot valve spool, close more tightly, open the small torque.
Right to request correction of the percentage of properties such as valves, valve cage is composed of different combination of labyrinth disc. Near the seat of the parts, pieces of the entrance channel a small maze, but there are fewer turns series to meet the need for large pressure, low flow requirements. Valve cage in the middle of the maze film was a moderate amount of the entrance channel and turning small series, to handle media pressure drop and flow medium. The top of the valve cage, a large number of discs used in the maze entrance channel and turning little series, to accommodate the smaller medium voltage drop and great flow. Boiler 1, 2 by warm water and steam injection heavy oil thermal recovery systems, flow control precision high-temperature high-pressure differential flow control valve effect of such occasions, excellent selection.