跳至主要内容

YFL Check Valves Operation and Maintenance Manual


1. General


Thanks for your selection of YFL check valve. As a type of pressure equipment, valve has potential hazards of pressure resulting from leakage of process fluid. For the safety purpose, user shall read this instruction to know what YFL has already taken into account in our design and manufacture, and what action shall be taken by user according to essential health and safety requirements of European Directive 97/23/EC(PED) .


2. Essential health & safety requirements of PED

2.1 What’s YFL design idea


-Check valve are designed as standard product, no consideration of each specific service condition since its too wide.

-Check valve is designed to BS1868, API 6D, valve has adequate strength according to ASME B16.34 pressure-temperature rating. The check valve was EC-type approved by European Notified Body.
-Valve has different sealing materials in accordance with BS1868, API 6D which are corrosion/wear resistance to certain type of fluid.


2.2 What action user shall taken


2.2.1 General
2.2.1.1 In any occurrence, first ensure personnel safety.
2.2.1.2 Use the valves in accordance with ASME B16.34 pressure-temperature rating.
2.2.1.3 Make sure that the selected valve materials are corrosion/wear resistance to the service fluid.
2.2.1.4 Where the service fluid is flammable/explosive, to limit the working temperature.
2.2.1.5 When performing Repair/maintenance operations, make sure that the valves are always depressurized, vented and drained.
2.2.1.6 When performing Repair/maintenance operations, always use appropriate protection e.g. protective clothing, (oxygen) masks, gloves, etc.
2.2.1.7 When performing Repair/maintenance operations, do not smoke, do not use any portable no-Ex-proof electrical device in the area and do not use open fire without a valid work permit.
2.2.1.8 Valve must periodically checked on:
-Tightness of bolted connection (body/bonnet, flange connection).
-Corrosion/wear damages (crack, pitting, thickness of the valve).


3. Working Principle and Structure Description


3.1 Working principle


This serial is sole direction check valve, when fluid flows at normal direction, the disc opens to fluid pressure; when fluid flows converse, the disc closes to the gravity and converse fluid pressure and cut off the bore.


3.2
Structure description

3.2.1 Flange end or but welding end may be selected as to purchaser optimum.
3.2.2 Valves use a reinforced flexible graphite gasket or spiral wound gasket. ..
3.2.3 The 50 bevel seal is used for the valve and the seal material is applied to API 600 or to the customer requirements.

4. Valve Transportation


4.1 Valves are heavy and metal products, care shall be taken to avoid physical injury during transportation. Before transportation, cord and lift device and transportation tool shall be ready, valve package inspected and broken package repaired. Packaging shall conform to specification requirements.
Valve shall be handled with care, no damage the flange end or butt welding end.


4.2
The paint, nameplate and flange sealing surface shall be protected during transportation, no drag valve on the ground especially with the end sealing surface contacted the ground.


4.3
Don't unpack when the valve is not ready for installation at the construction field. The valve shall be placed at a safety location against whether.


5. Servicing


5.1 Where contractually specified, YFL Flow Control Co., Ltd. may provide field installation and adjustment.


5.2
YFL will trace the quality of sold valve and provide service to customer requirements..



评论

此博客中的热门博文

Copper rod machine melting,Copper rod upcasting machine,Copper plating line

China is short of copper, and China is also a big copper user. At present, the copper consumption of China's cable industry is about 7.5 million tons, accounting for more than 60% of China's total copper consumption, accounting for about 1 percent of the world's total copper conductor consumption, making it the largest copper user in the world. In order to solve the serious situation, the smart Chinese people try to use the machine which could meet the energy-saving requirement to produce the cooper rod. D&S copper rod making machine adopts the advanced fire refining technology to produce the¢8MM bright low-oxygen copper rod which is meet the international standards in the continuous casting line. The features of the production line are continuous casting and rolling process. There is no interruption from melting of raw material, casting process, rolling process and delivery of product, and it has high efficiency due to automatic control throughout the entire process. ...

Why is my roller shutter motor not working?

 There could be several reasons why your roller shutter motor is not working. Some common causes include: Power source: Check the power source to ensure that the motor is properly connected and has a steady supply of electricity. Remote control: If the motor is controlled by a remote control, check the batteries or try a different remote control to make sure it's not the cause of the problem. Motor fuse: Check the motor fuse to see if it has blown and needs to be replaced. Control circuit: If the control circuit is faulty, the motor may not receive the signal to start and stop, or it may not receive the correct power and speed signals. Encoder: If the encoder is not functioning properly, the control circuit may not be able to accurately determine the position of the motor and control its movement. Gearbox: If the gearbox is damaged, the motor may not be able to transmit power to the electric roller shutter , and it may not move. Motor: If the motor is damage...

Realization of current detection in automobile electronic system

Here mainly introduces the detection method of electric current, find some factors that are easy to be neglected in the design. First consider two different methods: the detection method based on the magnetic field and the detection method based on the shunt. 1. Magnetic field-based detection methods (represented by current transformers and Hall sensors) have many advantages, such as good isolation and low power loss, which makes it more widely used in power drive technology and high current fields, but It also has shortcomings, such as large size, unsatisfactory compensation characteristics, linearity, and temperature characteristics. 2. Shunt method High-precision low-resistance resistors currently have the characteristics of high power and small size. This method has low cost and high accuracy. More used in automotive electronics. If you want to realize the anti-pinch function, you usually use two methods for detection at the same time. The following takes the window control as an ...