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

Full-servo pull up diaper production line

With the development of  technology, the diaper machinery industry is also progressing with it. This time, XINGYUAN DNW machinery launched full servo Pants production line. This production line can be compatible with two or three pieces, and can be designed into two or three pieces and other configurations according to customers' requirements. In order to meet the needs of customers, there are many optional configuration, O cutting unit, we used is the industry's top brands, PNO, HCH also used this brand. Basic configuration is controlled by servo motor, the brand is mitsubishi. Reasonable and solid square steel frame, painted with baking paint, with second working platforms. A customer asked how to make a diaper , and we showed him the whole production process. He was very pleased to say that your process for making diapers is the same as that of HCH and Xing Shi. The workshop is very clean, good quality, low price, very cost-effective. Now let's take a look ...

Chiller installation technology

1. When selecting the position of the lifting point, first consider the best position of the air circulation, and secondly consider the direction of the structure of the storage body. 2. The gap between the chiller and the slab should be greater than the thickness of the chiller . 3. All the slings of the chiller should be tightened, and the bolts and slings should be perforated with sealant to prevent cold bridge and air leakage. 4. When the ceiling fan is too heavy, use the No. 4 or No. 5 angle iron as the lintel. The lintel should span across the other roof and wall panels to reduce the load. Small Water Chiller Units   Laser Chiller Systems   Industrial Air Chiller

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. ...