Main features of MFC-HI arrester discharge counter action tester â—† Suitable for valve arresters (including ordinary valve type of carbonized silicon (FZ and FS), carbonized silicon magnetic blow valve type (FCZ and FCD)) and discharge recorder of zinc oxide arrester Discharge action detection and verification.
Technical Parameters:
◆Discharge test voltage: more than 0~2KV
â—† Charging time: less than 1min
◆ Power supply for the instrument: AC220±10%50HZ
Power consumption is less than 30VA
◆ Instrument size: 300×220×180(mm)
â—† Instrument weight: 6kg
MOA-30KV Zinc Oxide Arrester DC Parameter Tester Product Overview The MOA-30KV Zinc Oxide Arrester DC Parameter Tester is designed to detect internal defects in 10kV and below power system gapless zinc oxide surge arrester MOA valve contacts, measuring MOA The DC reference voltage (U1mA) and leakage current at 0.75U1mA.
Features:
â—† MOA-30KV zinc oxide surge arrester DC parameter tester with automatic measurement, easy to operate, fast use of automatic control principle 1mA current and 0.75 times the DC reference voltage for precise closed-loop adjustment, using a microcomputer to control the measurement process, only need to press a button It can automatically measure the DC reference voltage at 1mA of the zinc oxide surge arrester and the leakage current at 0.75 times the DC reference voltage. The whole process takes only 15 seconds, which is very suitable for batch measurement.
â—† MOA-30KV zinc oxide lightning arrester DC parameter tester adopts integrated structure, small size, light weight. The instrument combines DC high-voltage power supply, measurement and control system into one body. All components are concentrated in one chassis, with small size, light weight, etc. Features.
◆ MOA-30KV zinc oxide surge arrester DC parameter tester adopts special process design, simple wiring technology parameters ◆ Measurement range: voltage 0~30kV
Current: 0~1000μA
â—† Measurement accuracy: voltage 1%
◆Environmental temperature:0~+40°C
◆Relative humidity: ≤85% at 25°C
â—† Altitude: <1000M
◆ Supply voltage: 220V±10%
◆Power frequency: 50±1HZ
Arrester AC characteristics:
â—†MLC-HI Zinc Oxide Arrester Property Tester is a special test instrument for on-site and laboratory detection of the relevant electrical parameters of lightning arresters.
â—† MLC-HI zinc oxide surge arrester characteristics tester takes the advanced microcomputer as the control and operation core, adopts accurate mathematical model, fully considers the external interference to the instrument measurement, and the software itself is accurate and reliable.
â—† MLC-HI Zinc Oxide Lightning Arrester Characteristics Tester adopts a special weak signal sensor and is completely isolated from the measured arrester, which ensures the safety of the instrument and the user.
â—†MLC-HI zinc oxide arrester characteristics tester adopts large-screen liquid crystal display.
â—†In order to facilitate the user to analyze and save the test data, MLC-HI Zinc Oxide Arrester Property Tester can store the test data of the first 20 times, which is convenient for user inquiries, and configures a micro-printer to select whether to print the data. .
Technical indicators:
â—† Measurement parameters and range:
◆AC voltage: 2~220V
â—†Leakage full current (effective value: 0 ~ 20mA
◆Resistive leakage current (peak):0~20mA
â—†Capacitive leakage current (effective value): 0 to 20mA
â—† Third harmonic value (peak value) of leakage current: 0 to 20mA
◆Lightning arrester power consumption:0~9999W
â—† In addition to displaying the above measurement values, the voltage and full current waveforms can also be displayed.
â—† Measurement accuracy: 2%
â—†Input signal:
â—† Voltage (peak): PT's low-voltage test AC2 ~ 200V
â—† Current (peak): AC0 ~ 20mA
â—† Supply voltage: AC220V+10%50HZ+2%
â—†Working environment:
◆Temperature: -10~40°C
◆Humidity: ≤85%
A ball check valve is a check valve in which the closing member, the movable part to block the flow, is a spherical ball. In some ball check Valves, the ball is spring-loaded to help keep it shut. For those designs without a spring, reverse flow is required to move the ball toward the seat and create a seal. The interior surface of the main seats of ball check valves are more or less conically-tapered to guide the ball into the seat and form a positive seal when stopping reverse flow.
Ball check valves are often very small, simple, and cheap. They are commonly used in liquid or gel minipump dispenser spigots, spray devices, some rubber bulbs for pumping air, etc., manual air pumps and some other pumps, and refillable dispensing syringes. Although the balls are most often made of metal, they can be made of other materials, or in some specialized cases out of artificial ruby. High pressure HPLC pumps and similar applications commonly use small inlet and outlet ball check valves with both balls and seats made of artificial ruby, for both hardness and chemical resistance. After prolonged use, such check valves can eventually wear out or the seat can develop a crack, requiring replacement. Therefore, such valves are made to be replaceable, sometimes placed in a small plastic body tightly-fitted inside a metal fitting which can withstand high pressure and which is screwed into the pump head.
There are similar check valves where the disc is not a ball, but some other shape, such as a poppet energized by a spring. Ball check valves should not be confused with Ball Valves, which is a different type of valve in which a ball acts as a controllable rotor to stop or direct flow.
A diaphragm check valve uses a flexing rubber diaphragm positioned to create a normally-closed valve. Pressure on the upstream side must be greater than the pressure on the downstream side by a certain amount, known as the pressure differential, for the check valve to open allowing flow. Once positive pressure stops, the diaphragm automatically flexes back to its original closed position.
A swing check valve or tilting disc check valve is check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. The seat opening cross-section may be perpendicular to the centerline between the two ports or at an angle. Although swing check valves can come in various sizes, large check valves are often swing check valves. The flapper valve in a flush-toilet mechanism is an example of this type of valve. Tank pressure holding it closed is overcome by manual lift of the flapper. It then remains open until the tank Drains and the flapper falls due to gravity. Another variation of this mechanism is the clapper valve, used in applications such firefighting and fire life safety systems. A hinged gate only remains open in the inflowing direction. The clapper valve often also has a spring that keeps the gate shut when there is no forward pressure. Another example is the backwater valve (for sanitary drainage system) that protects against flooding caused by return flow of sewage waters. Such risk occurs most often in sanitary drainage systems connected to combined sewerage systems and in rainwater drainage systems. It may be caused by intense rainfall, thaw or flood.
A stop-check valve is a check valve with override control to stop flow regardless of flow direction or pressure. In addition to closing in response to backflow or insufficient forward pressure (normal check-valve behavior), it can also be deliberately shut by an external mechanism, thereby preventing any flow regardless of forward pressure.
A lift-check valve is a check valve in which the disc, sometimes called a lift, can be lifted up off its seat by higher pressure of inlet or upstream fluid to allow flow to the outlet or downstream side. A guide keeps motion of the disc on a vertical line, so the valve can later reseat properly. When the pressure is no longer higher, gravity or higher downstream pressure will cause the disc to lower onto its seat, shutting the valve to stop reverse flow.
An in-line check valve is a check valve similar to the lift check valve. However, this valve generally has a spring that will 'lift' when there is pressure on the upstream side of the valve. The pressure needed on the upstream side of the valve to overcome the spring tension is called the 'cracking pressure'. When the pressure going through the valve goes below the cracking pressure, the spring will close the valve to prevent back-flow in the process.
A duckbill valve is a check valve in which flow proceeds through a soft tube that protrudes into the downstream side. Back-pressure collapses this tube, cutting off flow.
A pneumatic non-return valve.
Multiple check valves can be connected in series. For example, a double check valve is often used as a backflow prevention device to keep potentially contaminated water from siphoning back into municipal water supply lines. There are also double ball check valves in which there are two ball/seat combinations sequentially in the same body to ensure positive leak-tight shutoff when blocking reverse flow; and piston check valves, wafer check valves, and ball-and-cone check valves.
Check Valves, Water Check Valves, Brass Check Valves, Sanitary Check Valves
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