Blog

18

2018

/

01

Y-type stop valve for hydraulic systems

Y type cut-off valve is mainly used in the hydraulic system of a valve, mainly to the work of the switch. Y type cut-off valve is the main opening and closing device. The sealing surface of Y-type globe valve is mainly divided into two ways: plane and cone. Y type cut-off valve is a straight line along the center line of the oil movement, movement is mainly divided into the following. One of them is the lifting type valve stem, which is mainly the lifting of the valve stem during the movement and the pulley does not move. Another is the lifting rotation mode of the valve stem, the stem of the cut-off valve is set on its nut, the movement of the valve stem and hand wheel to do rotary lifting. Currently, the Y

15

2018

/

01

Classification, installation and maintenance of pressure reducing valve

1. classification: according to the structure can be divided into film type, spring film type, piston type, lever type and bellows type. According to the number of seat can be divided into single seat type and double seat type. According to the position of the disc can be divided into positive and reaction type. According to the use of media can be divided into steam pressure reducing valve, air pressure reducing valve, gas pressure reducing valve and so on. 2. selection: according to the requirements of the use of selected pressure reducing valve type and pressure regulating accuracy, and then according to the maximum output flow required to select its diameter. When determining the air supply pressure of the valve, it should be greater than the maximum output pressure of 0.1MPa. The pressure reducing valve is generally installed after the water separation filter and before the oil mist device or the constant value device, and pay attention not

14

2018

/

01

Valve installation and flange welding

1, the installation of the valve valve installation is best to use the ring installation, the use of chain installation, pay attention to the valve coating to take protective measures. When the valve is equipped with a bracket or transmission mechanism, the lifting rope should be fixed on the valve lifting ring, and the lifting rope cannot be placed on the transmission mechanism; the lifting rope or lifting chain cannot squeeze the external parts of the valve and its extension rod, so as not to damage the valve actuator, resulting in the valve can not be opened or closed difficult. 2. Welding of the valve (1) After the valve is in place, the valve should be placed in the fully open position during preheating and welding of the valve. Otherwise, during the welding process, the gate of the gate valve will be stained with welding slag, which will be attached during production.

12

2018

/

01

Flange valve failure troubleshooting method

Flange valve failure causes and solutions there are four of the most common fault phenomenon, generally for the valve middle flange leakage, stuffing box leakage, sealing surface leakage, stem rotation is not flexible. The reasons and solutions for the leakage of the middle flange of the 1.: 1. The flange connecting bolts are not tightened or the tightness is uneven. Solution: loosen the bolts and tighten them evenly and symmetrically again. 2. Gasket damage or failure. Solution: replace the gasket. 3. There is dirt between flange sealing surfaces. Solution: Remove the cleaning flange. 2. stuffing box leakage: 1, packing loose or packing gland bias. Solution: the packing gland should be uniform pressure

11

2018

/

01

The role of the automatic exhaust valve on the water supply system

When there is gas overflow in the system, the gas will climb up the pipeline and finally gather at the highest point of the system. The automatic exhaust valve is generally installed at the highest point of the system. When the gas enters the exhaust valve cavity and gathers at the upper part of the exhaust valve, the pressure rises with the increase of the gas in the valve. When the gas pressure is greater than the system pressure, the gas will drop the water level in the cavity, and the float will open the exhaust port, as the water level rises, the pontoon also rises, closing the exhaust port. By the same token, when negative pressure is generated in the system, the water surface in the valve cavity drops and the exhaust port opens. At this time, the external atmospheric pressure is greater than the system pressure, so

02

2018

/

01

Precautions for valve pressure test

General valve pressure test needs to comply with the following principles and precautions:(1) under normal circumstances, the valve strength test is not made, but after repair the valve body and valve cover or corrosion damage of the valve body and valve cover should be strength test. For the safety valve, the constant pressure and back seat pressure and other tests shall comply with the specifications and relevant regulations. (2) The strength and tightness test shall be made for the installation of the valve. Low pressure valve spot check 20%, such as unqualified should be 100 inspection; Medium and high pressure valves should be 100 inspection. (3) During the test, the valve installation position should be in the direction convenient for inspection. (4) welding connection form of the valve, with blind plate

25

2017

/

12

Selection of control valve should pay attention to the problem

1. Regulating function ① requires the regulating valve to act smoothly; ② small opening adjustment performance is good; ③ select the required flow characteristics; ④ meet the adjustable ratio; ⑤ small resistance and large flow ratio (ratio of rated flow parameters of regulating valve to nominal diameter);⑥ adjust speed. 2, leakage and cut-off pressure difference This is an inseparable, interrelated two factors. Leakage should meet the process requirements, and the reliability of the sealing surface of the protection measures; cut off the pressure must be put forward, so that the selected control valve has enough output force to overcome it, otherwise it will lead to the implementation of the agency to choose large or small. 3, anti-blocking even clean media, there is also a blockage problem, this is

20

2017

/

12

How to operate a manual valve

Manual valve, is through the handle, hand wheel operation of the valve, is the equipment pipeline on the use of a common valve. Its handle and handwheel rotate clockwise to close and counterclockwise to open. However, there are also individual valves that open the opposite of the above. Therefore, before the operation should pay attention to check the opening and closing signs before operation. The handwheel and handle on the valve are designed according to normal manpower. Therefore, it is stipulated that the operator is not allowed to open or close the valve with the help of levers and long wrenches. If the diameter (length) of the handwheel and handle is less than 320mm, only individual operation is allowed. If the diameter of the handwheel is more than 320mm, two persons are allowed to operate together, or

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