Hydraulic valve size and type, shall comply with the requirements of piping design documents. Valve model should be specified based on GB number requirements. If the enterprise standards, instructions should specify the model. Valve working pressure, working pressure ≥ pipeline requirements, without affecting the price of the premise, the valve can withstand working pressure should be greater than the actual working pressure pipelines; either side of the valve closing conditions under should be able to withstand 1.1 times the working pressure valve value without leakage; under the valve open position, the valve should be able to withstand twice the working pressure valve requirements. Valve manufacturing standards, should explain the basis of the national standard number should be attached if the enterprise standard business documents, purchasing the contract.
Because of gray cast iron pipe valve material gradually is not recommended, should be ductile iron main body material, and indicate grades and casting actual physical and chemical test data. Stem material, and strive stainless steel stem, large diameter valves should also be embedded in the package of stainless steel stem. Nut material, cast brass or aluminum bronze, and the hardness and strength are greater than the stem. Stem bushing material, its hardness and strength shall be not greater than the stem, and is immersed in water conditions and valve body is formed of electrochemical corrosion.
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Sealing surface of the material: (1) Valves category different sealing methods and materials requirements; (2) ordinary wedge gate valve, brass ring of material, fixing, polishing should note; (3) soft sealing valve, physical chemistry and health testing data valve plate rubber lining materials; (4) should be marked on the valve body sealing surface material and the sealing surface material butterfly board; their physical and chemical test data, especially the health requirements of the rubber, anti-aging properties , wear resistance; usually NBR and EPDM rubber, non-mixed with recycled plastic.
Valve shaft packing: (1) As the pipe network in the valve, which is usually not open and close frequently, requiring several years of inactivity filler, filler nor aging, long-term effects remain sealed; (2) fill valve shaft should also bear when frequent opening and closing, good sealing effect; (3) in view of the above requirements, fill valve shaft life does not seek to replace or not to replace more than a decade; (4) To replace the filler valve should be designed to have a pressure situation measures under replacement.
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Hydraulic valve is an automated device operated by oil pressure, it is subject to the control pressure valve pressure oil is usually used in combination with electromagnetic pressure control valve can be used for remote control of hydropower oil, gas, water pipeline system off. Commonly used in the clamp, control, lubrication circuit. There are direct acting and pilot-points, multi-pilot type.
Used to reduce and stabilize the system, a branch of fluid pressure, commonly used in the clamp, control, lubrication circuit. There are direct acting, pilot type, overlay type of points
Classification
Press the control method of classification: manual, electric, hydraulic control
Classified by function: flow valve (throttle valve, control valve, flow diversion valve), pressure valves (pressure relief valve, pressure reducing valves, sequence valves, unloading valves), directional valve (solenoid valve, manual change to the valve, check valve, check valve)
By installation of: plate valves, valves, modular valves, cartridge valves, valve cover [1]
Direction control
Use is divided into one-way valve and valve. A check valve: in turn allows only unidirectional fluid conduit, i.e., the reverse cut. Valve: change the pass, breaking the relationship between the different lines. According to the spool valve in the number of job positions in the sub-two, three, etc.; according to the number of channels under the control of two-, three, four, five-way, etc.; points manually based on the spool drive, motor, electric , hydraulic, and so on. Figure 2 is a three way valve works. The supply port P, O is the return port, A, B is an output port leading to the actuator. When the spool is in the neutral position, all ports off, the actuator does not move; when the spool is moved to the right position, P, and A pass, B and O on; when the spool is moved to the left position, P, and B Tong, A and O on. Thus, the actuator can be positive and reverse movement.
The late 1960s, on the basis of the several hydraulic control valves on and developed the electro-hydraulic proportional control valve. Its output electrical signal (pressure, flow rate) changes continuously with the input energy. Electro-hydraulic proportional control valve according to the role of different, accordingly divided into electro-hydraulic proportional pressure control valves, electro-hydraulic proportional flow control valves and electro-hydraulic proportional directional control valve.
Pressure Control
Use is divided into ﹑ relief valve and sequence valve. ⑴ relief: the hydraulic control system to maintain a steady state is reached at the set pressure. Called safety valve relief valve for overload protection. When the system fails, the pressure increases to cause damage to the limit value, the overflow valve port open to ensure the safety of the system. ⑵ valve: to get control over the main circuit branch circuit stable oil pressure down. It controls the pressure relief valve according to different functions, can be divided into fixed value valve (output pressure is a constant value) ﹑ or worse valve (pressure difference between input and output value) and fixed ratio valve (between input and output pressure to maintain a certain ratio). ⑶ sequence valve: make an actuator (such as hydraulic cylinders ﹑ hydraulic motors, etc.) after the operation, and then make the other actuator action sequence. Pressure pump generates the first hydraulic cylinder a campaign to promote, through the inlet valve action sequence in area A, when a sport completely into the cylinder, the pressure increases, the role of the upward thrust in the area A is greater than the spring it is set after the value, so that the spool rising oil inlet port communicates with the hydraulic cylinder 2 motion.
Flow Control
An adjustment orifice area between the valve and the valve body and the local resistance it generates the traffic regulation to control the movement speed of the actuator. Flow control valve use is divided into five kinds. ⑴ throttle: After adjusting fixed orifice area, make little change in load pressure and velocity of movement of the actuator less demanding uniformity basically stable. ⑵ control valve: When the load pressure changes can keep the throttle valve pressure drop is constant. Thus, the orifice area after it is set, regardless of how the pressure changes in load, speed through the throttle valve can maintain constant flow, so that the velocity of the actuator stability. ⑶ shunt valve: no matter the load size, can perform the same oil source for the two components to get the same amount equal to the flow diverter valve is a valve or synchronization; been allocated in proportion to the ratio of the flow diversion valve. ⑷ flow valve: the role of contrast with the diverter valve so that the inflow manifold valve flow prorated. ⑸ shunt valve assembly: both shunt valve and manifold valve two functions.
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Claim
1) Action flexible, reliable effect, shock and vibration at work, low noise, long service life.
2) When the hydraulic fluid through the valve, pressure loss; When the valve port closed, good sealing performance, the leak is small, no external leakage.
3) the control parameter (pressure or flow) stability, the smaller the amount of change by external interference.
4) Compact, installation, commissioning, use, easy to maintain, common good
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