Relief valve working principle:

The valve is the control valve opening and closing parts of the opening to adjust medium flow and reduce the pressure of the medium, and at the same time with the valve after the pressure regulating opening and closing parts of the opening, the valve after the pressure was maintained at a certain range, and the valve body or valve sprayed into the cooling water, lowering the temperature of the medium the, this valve called for temperature and pressure reduction valve. Pressure relief valve is fast and easy to have a collection of automatic selection. The characteristics of the valve is in the case of constant inlet pressure to maintain the outlet pressure and temperature values within a certain range.

Decompression valve according to the structure can be divided into film, spring diaphragm, piston, lever type and corrugated tube type; according to the seat number, pleasant for the single seat and two seat type; according to the different position of the valve flap can be divided into the positive effects type and the reaction type. Pilot operated pressure reducing valve when the valve output pressure is higher or larger diameter, with a direct voltage regulator spring, the spring stiffness must too large, flow rate changes, output pressure fluctuation is larger, the structure of the valve size will increase. In order to overcome these shortcomings, the pilot valve can be used. Pilot operated relief valve working principle and straight moving type of basically the same. The pilot operated pressure reducing valve is used for pressure regulating gas, which is supplied by a small direct acting pressure reducing valve. If the small direct acting pressure reducing valve installed in the body, it is called the internal pilot type pressure relief valve; if the small direct acting pressure relief valve installed in the main body outside, it is called the external pilot type pressure relief valve.

Combination type

Configuration structure of combined type pressure reducing valve

1 - Safety pull rod

2 - safety lock nut

3 - adjustment lever

4 - lifting nut

5 - lock nut

6 - pressure conduit

7 - valve cover

8 - jet pump

9 - three way conversion valve

10 - control valve

11 - discharge valve (discharge of impurities in the water. Automatic discharge type for the solenoid valve)

12 - exit pressure lock valve

13 - body

Internal structure of combined type pressure reducing valve:

1, combined valve automatic adjustment principle:

Combination type pressure reducing valve is a kind of pressure relief valve which can be used in the complicated and changeable conditions, which can be used to adjust the pressure of the pressure regulator valve. Its complete realization of self control, debugging is simple, reliable operation.

2, combined valve of the double feedback switching principle:

The feedback system of the combined type pressure reducing valve is an independent system for controlling the flow area (throttle opening) according to the change signal of the outlet pressure of the pressure reducing valve. Pressure relief valve is equipped with a mutual backup of the dual feedback system, enabling the A system that is deactivated B system operation mode can achieve the purpose of reducing valve maintenance.

3, combined with the principle of the discharge valve recoil:

The operating conditions of the hydropower station are quite complex, especially the water quality is directly related to the safe operation of the equipment. For the large sediment concentration of hydropower station, except in valve flow position using stainless steel and nickel base alloy abrasion proof outer, valve recoil sewage device can effectively prevent the feedback control system of congestion, pressure reducing valve in silt sundries in water to maintain good working conditions. (recoil sewage system standard for manual control, according to the actual situation of water quality grasp recoil sewage frequency, or direct the use of PLC automatic backwashing drainage device.

4, combined valve outlet pressure locking principle:

Each a qualified decompression valve body were subjected to a more than 60 minutes 1.5 times crush experiment, to completely eliminate the defective valve, even after more than ten years of continuous operation also won't appear leakage fault rupture. The locking device in the outlet pressure is a rigid protection device to prevent the feedback system from being damaged by accident, and to maintain the safety of the outlet pressure P2 value when the main piston is under the pressure of the main piston.

Direct acting

Direct acting pressure reducing valve is shown as a direct acting relief valve with relief valve (referred to as the relief valve).

Relief valve is to rely on the throttle effect of air intake pressure, by the balance of force on the diaphragm and the overflow effect of the overflow hole pressure regulator; adjust the spring can make the output pressure change within a certain range. A small amount of gas pollution to the surrounding environment to prevent more type overflow valve irresolute, without the relief valve of the valve (ie, normal pressure reducing valve).

pilot type

Internal pilot valve when the valve output pressure is higher or larger diameter, with a direct voltage regulator spring, the spring stiffness must too large, flow rate changes, output pressure fluctuation is larger, the structure of the valve size will increase. In order to overcome these shortcomings, the pilot valve can be used. Pilot operated relief valve working principle and straight moving type of basically the same. The pilot operated pressure reducing valve is used for pressure regulating gas, which is supplied by a small direct acting pressure reducing valve. If the small direct acting pressure reducing valve installed in the body, it is called the internal pilot type pressure relief valve; if the small direct acting pressure relief valve installed in the main body outside, it is called the external pilot type pressure relief valve. Compared with the direct acting pressure reducing valve, the nozzle 4 and the baffle 3, the fixed throttle hole 9 and the gas chamber B are added to enlarge the nozzle baffle. When the distance between the nozzle and baffle small changes occur, will make B room pressure place obvious changes in the root, causing the diaphragm 10 has a larger displacement, to control the valve core 6 moves up and down, so that the intake valve port to open eight big or small, increase the sensitivity of the control valve core, that is, to improve the precision of the voltage.

Outside the main body, there is a small direct acting pressure reducing valve to control the main valve. These valves are suitable for the range of 20mm or more, long distance (less than 30m), high, dangerous place, difficult to adjust the occasion.

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