How to choose a pressure test pump? Let s talk about it

Shanghai Sunshine Pump Manufacturing Co., Ltd. is located in Jinshan Industrial Park, Shanghai, which is a well-known large-scale diversified enterprise integrating research, development, production, sales and service in China, with a registered capital of 80 million yuan. The leading products include: screw pumps, diaphragm pumps, submersible pumps, magnetic pumps, sewage pumps, chemical pumps, multistage pumps, self-priming pumps, gear oil pumps, metering pumps, sanitary pumps, vacuum pumps, submersible pumps, rotary lobe pumps and other categories.

The products have been recognized by various professional certifications and customers with superior performance and excellent quality. The company has a number of pump experts and all kinds of senior engineers, continuous development and manufacturing, upgraded products have come out every year. The company has a domestic high-level pump performance testing center, and all products adopt advanced designs such as CAD design software and CFD computational fluid dynamics software

Pressure test pump is specially used for all kinds of pressure vessels, pipelines, valves, boilers, cylinders, fire-fighting equipment, etc. for hydraulic testing and laboratory testing equipment for high-pressure liquid, its function is to convert the mechanical energy of the power engine (such as electric motor and internal combustion engine, etc.) into liquid pressure energy. Working principle: The cam is driven by an electric motor to rotate.

When the cam pushes the plunger upward, the sealing volume formed by the plunger and the cylinder body decreases, and the oil is squeezed out of the sealing volume and discharged to the required place through the check valve. When the cam rotates to the descending part of the curve, the spring forces the plunger downward, forming a certain vacuum, and the oil in the oil tank enters the sealing volume under the action of atmospheric pressure. The cam makes the plunger constantly rise and fall, the sealing volume periodically decreases and increases, and the pump continues to absorb and drain oil.

The pressure test method of the pressure test pump pipeline is as follows:

1. Strength test: the pressure gauge should be installed at the lowest point of the pipeline system, and the pressure pump should be set near the pressure gauge; The pipe should be filled with clean water, and the air in the pipe should be thoroughly discharged; Increase the pressure to the test pressure with a pressurized pump, and then re-pressurize to the test pressure every 10 minutes, repeat twice; Record the pressure after 10 minutes and 40 minutes after the last pumping pressure, and the pressure difference should not be greater than MPa;

2. Tightness test: the test should be carried out immediately after the strength test is qualified; The pressure was recorded 2 hours after passing the strength test. At the end of this pressure-specific strength test, the pressure drop of the hail bond should not exceed MPa.

1. Connect the pressure test pump: The pressure test pump is connected to the indoor water supply pipeline system from the lower pipe outlet of the indoor water supply pipeline through the connecting hose.

2. Inject water into the pipeline: open the main water valve to inject water into the indoor water supply pipe system, and at the same time open the pressure test pump pressure relief switch until the pipeline is filled with water and fill the water tank through the pressure test pump, immediately close the main water valve and the pressure test pump pressure relief switch.

3. Pressurize the pipeline: press the handle of the pressure test pump to pressurize the indoor water supply pipe system, and stop pressurizing when the pressure gauge of the pressure test pump indicates that the pressure reaches the test pressure (when the pressure is stopped.

4. Discharge the air from the pipeline: Slowly loosen the plug of each water outlet, and tighten the plug immediately when you hear the air being discharged or water spraying out.

5. Continue to pressurize the pipeline: operate the handle of the pressure test pump again to pressurize the indoor water supply pipe system, and stop pressurizing when the pressure gauge of the pressure test pump indicates that the pressure reaches the test pressure (when the pressure is stopped. Then complete the pressure test of the indoor water supply pipe system according to the specified inspection method.

After the test is completed, turn on the pressure relief switch of the pressure test pump to remove the pressure in the pipeline.

Correct use of manual pressure test pump:

1. Check whether the threaded connection is tightened before use, and drop a few points of oil at the piston and handle hinged pin shaft to facilitate lubrication.

2. The range of the pressure gauge should be greater than the pressure times.

3. Before the test, fill the test container with a clean test medium and exhaust the air as much as possible. The test circuit of the micro pressure vessel (volume 2 4L) should be equipped with an energy storage vessel of not less than 2 4, as shown in Figure 2. It is strictly forbidden to use media containing sediment and other debris.

4. Shake the handle, there should be no blocking phenomenon and other abnormal conditions, and the force should be stable and even, and it should not be knocked.

5. It is forbidden to exceed the rated pressure during normal operation.

6. If there is a slight water leakage in use, it should stop working immediately for inspection and repair.

7. After use, the water in the water tank and pump head should be drained, and a certain amount of oil (it is advisable to flow out from the discharge port) should be injected from the suction inlet of the pump.

8. When the ambient temperature is below 0, add appropriate antifreeze when the working medium is water, or take other antifreeze mistakes.

Manual high-pressure pressure test pump.

1. Before the pressure test pump is used, check in detail whether the joints of each part are tightened, whether the pressure gauge is normal, whether the inlet and outlet pipes are installed, and the working medium of the pump is 5 50 water, emulsion or oil with a kinematic viscosity of <45mm2 s. It is forbidden to use unclean water with sediment and other debris. 2 In order to improve the efficiency of pressure testing, the test container or equipment can be filled with water first, and then connected to the outlet pipe of the pressure test pump.

3 During the pressure test, if you find that there is a lot of air in the water, you can unscrew the water valve and release the air. 4. If any subtle water seepage is found during the pressure test, the work should be stopped immediately for inspection and repair, and it is strictly forbidden to continue to increase the pressure in the case of water seepage. 5. After the pressure test is completed, loosen the water valve first, and the pressure drops to avoid damage to the pressure gauge.

6. When the pressure test pump is not in use, drain the water in the pump and suck in a small amount of oil to prevent corrosion. 5. Fault and Elimination Method Cause of Failure Phenomenon Elimination Method The pressure of the pump rises too slowly or does not rise 1Insufficient water sources 2

The water source contains sediment or other debris 3Suction pipe intake 4Seal damaged 5

Valve does not seal 6The space of the loose test container on the street is too large1Add an appropriate amount of water 2

Swap the water 3Clear the air leak 4Replace the seal 5

Remove and inspect for cleaning or repair, replacement 6Tighten the streets 7Fill it with clean water and drain the air in the container first, and the holding time is too short or not pressurized1

Poor sealing of the check valve in the outlet street 2The drain valve is not closed tightly 3There is a leak in the pressure gauge street 4

There is a leak at the connection between the pump and the device under test1Cleaning, repairing or swapping 2Tighten the drain valve 3 properly

Tighten the fitting or swap the washer 4Check to rule it out.

The manual pressure test pump is composed of a pump body, a plunger, a sealing ring, a control valve, a pressure gauge, a water tank, etc.

Outline how it works separately:

When the plunger is lifted up through the handle, a vacuum is generated in the pump body, the water inlet valve opens the water inlet filter screen and the water inlet pipe enters the pump body, the water inlet valve is closed when the handle is pressed down, the water outlet valve is opened, the pressure water is output, and the device under test is entered, so that the work is carried out back and forth to achieve the pressure test of the rated pressure.

There is a screw that is not tightened in pressing.

The pressure test pump has the characteristics of compact structure, reasonable, labor-saving operation, light weight, convenient maintenance, rust prevention, and the electric pressure test pump is driven by a motor, which greatly improves the work efficiency.

The electric pressure test pump is a reciprocating piston pump, the motor drives the plunger, drives the movement of the slider and then injects water into the pressure test object, so that the pressure gradually rises. The machine is composed of a pump body, a switch, a pressure gauge, a water tank, a motor, etc.

Electric pressure test pump (hereinafter referred to as pressure test pump) is suitable for water or hydraulic oil medium, pressure test on various pressure vessels, pipelines, valves, etc., and is also used as hydraulic energy to provide the required pressure, suitable for chemical, construction, plumbing, petroleum and coal, smelting and shipbuilding and other industries.

As an intermediate medium in the hydraulic transmission system, the electric pressure test pump transmits and converts energy. At the same time, it also plays the role of lubrication, anti-corrosion, cooling and flushing of various parts of the hydraulic pressure test pump.

Its main attribute is suitable viscosity, good viscosity temperature characteristics viscosity is the first factor to consider when choosing hydraulic fluid. At the same working pressure, if the viscosity is too high, the resistance to the movement of the hydraulic components will increase, and the heating will accelerate the hydraulic pressure. The self-priming capacity of the pump decreases, and the pressure drop and power loss in the pipeline increase; If the viscosity is too low, it will increase the volume loss of the hydraulic pump, increase the leakage of the element, make the oil film of the sliding part thinner, and the support capacity will decrease.

Good lubricity (anti-wear): Hydraulic pressure test pumps have a large number of moving parts that need to be lubricated to prevent wear on relatively moving surfaces, especially for high-pressure systems, which have much higher requirements for the anti-wear performance of hydraulic oil.

Hydraulic pressure test pumps are also oxidized during use. The acidic substances produced by the oxidation of hydraulic oil can increase the corrosiveness of the metal, and the resulting sludge deposits can clog filters and small crevices. It doesn't work properly to make the hydraulic system, so good KYH performance is required.

Because hydraulic fluids are subjected to severe shear as they pass through pumps, valve holes, and clearances, they can cause some macromolecular polymers in the oil to break down, such as the molecules of tackifiers. It becomes a small molecule, which reduces the viscosity. When the viscosity is reduced to a certain level, the oil cannot be used, so good shear resistance is required.

25 * m = m an atmosphere of pressure is about 1 kg of pressure, the height of the water column of rice, 25 kg is about 25 atmospheres of pressure, so it is equivalent to the height of the water column of the meter, if you want to hit 25 kg higher, there is nothing you can do, so when the water pipe is erected vertically above the meter, the pressure test pump can no longer pump the water pump.

The pressure test pump is mainly used as a pressurization equipment used in the pressure test of various pressure vessels and equipment (such as chemical vessels, pump bodies, valves and pipelines, etc.). Therefore, its biggest feature is that the discharge pressure is very high, the general pressure test pump reaches hundreds of atmospheres, the ultra-high pressure pressure test pump reaches tens of thousands of atmospheres, and the flow rate is generally small, most of them are less than 1m3 h. However, the small output flow does not increase the time required for the pressure test, because the pressure test of the container is not completed after the pressure test pump is filled.

Usually, the pressure test process needs to fill the container with liquid first, and then leave a joint to connect with the outlet of the pressure test pump. The principle that the liquid has the equivalent value of the force is transmitted, so that when the outlet of the pressure test pump reaches a certain pressure value, the container is also subjected to this pressure accordingly, so as to achieve the purpose of the test pressure.

The working liquid of the pressure test pump is generally water, but it can also be pure mineral oil. Generally, there are two main types of pressure test pumps: manual and electric.

Due to the high discharge pressure of the pressure test pump, the manual pressure test pump generally belongs to the single-acting piston reciprocating pump, which is mainly composed of the pump body, plunger, hand crank handle and water discharge valve.

The basic structure of an electric pressure test pump is about the same as that of a manual pressure test pump. The pump cylinder consists of 4 single-acting plungers. The transmission part relies on the motor to drive the worm gear and worm deceleration device, and the eccentric wheel on the worm gear shaft pushes the plunger to reciprocate.

1. The inlet pipe of the pump and the outlet water pipeline are blocked, the inner cavity of the pump is isolated from the outside world, and the pump cavity is filled with water, leaving only the imitation hole to connect with the pressurized equipment.

2. Turn on the pressurization equipment, pressurize slowly, add and stop, observe whether there is leakage of water in the pump body, pay attention to the pump manual, the maximum pressure, and prohibit the overpressure test to prevent accidents.

3. Under the standard pressure, the water has no leakage, qualified, if there is a leak, the water is released to repair, and the pressure test is repeated after repairing the chaos until it is qualified.

There is a pressure tester on the market, you can buy one back and install it on the inlet pipe of the water pump for experiments.

The electric pressure test pump is a reciprocating piston pump, the motor drives the plunger, drives the slider to move, and then injects water into the pressure object to be tested, so that the pressure gradually rises. The machine is composed of a pump body, a switch, a pressure gauge, a water tank, a motor, etc.

1.Check the water level in the water tank and connect the power cord.

2.Tighten the handwheel switch clockwise.

3.Press the start button, the motor works, and when the pressure gauge pointer reaches the set rated pressure, the pressure will not go up.

4.At the end of the pressure test, the switch is loosened counterclockwise, and the medium flows back to the water tank.

In short, it is still more complicated, consider your own needs and consult the manufacturer more. The company used the electric pressure test pump produced by Chengdu Lifeng, and the pre-sales and after-sales service are very good, you can also go to consult.