kolink-valve

Butterfly valve is widely utilized in metallurgy, power station,
petroleum, chemical industry, air, gas, water suply and drain tubing
line which of corrosive medium.

A hydraulic class valve is made
up by two valves body named left body and right body, screw rob, sealing
ring, lever, hydrocylinder and other parts. It has a rigid structure
consist of seat and back shaft. The body’s cylinders each has function
of clamp and flap. The two body completely loose and clamp drives by the
lever and screw rob in the clamp putter. Flap cylinder drives the plate
to open and close. Rubber sealing ring set in the plate has the
character of high temperature resistant, good sealing performance, easy
to replace and long time life service etc.

This valve can remote
controlled and manual operated in abnormal condition.

Sanitary  Butterfly valve  product offered byZhongquan Group Yongjia Kolink Valve Co., Ltd.

A Gate valve, or Sluice Valve, as it is sometimes known, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. They are so-named because the part that either stops or allows  flow through the valve  acts  somewhat like a gate. The gate is usually wedge-shaped. When the valve is wide open the gate is fully drawn up into the valve bonnet. This leaves an opening for flow through the valve the same size as the pipe in which the valve is installed. Therefore, there is little pressure drop or flow restriction through the valve. 

Gate valves are sometimes used for regulating flow, but many are not suited for that purpose, having been designed to be fully opened or closed. They are used when a straight-line flow of fluid and minimum flow restriction are needed. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low friction loss. Gate valves are not suitable for throttling purposes. The control of flow is difficult because of the valve’s design, and the flow of fluid slapping against a partially open gate can cause extensive damage to the valve. Except as specifically authorized, gate valves should not be used for throttling.

Gate valves are characterized as having either a rising or a nonrising stem. Valves with rising stems are used when it is important to know by immediate inspection whether the valve is open or closed and when the threads (stem and gate) exposed to the fluid could become damaged by fluid contami- nants. In this valve, the stem rises out of the valve when the valve is opened. Nonrising stems are used where vertical space is limited or underground. The stem is threaded into the gate. As the hand wheel on the stem is rotated, the gate travels up or down the stem on the threads while the stem remains vertically stationary. This type of valve will almost always have a pointer indicator threaded onto the upper end of the stem to indicate the position of the gate.

Bonnets provide leak proof closure for the valve body. Gate valves may have a screw-in, union, or bolted bonnet. Screw-in bonnet is the simplest, offering a durable, pressure-tight seal. Union bonnet is suitable for applications requiring frequent inspection and cleaning. It also gives the body added strength. Bolted bonnet is used for larger valves and higher pressure applications. Another type of bonnet construction in a gate valve is pressure seal bonnet. This construction is adopted for valves for high pressure service, typically in excess of 15 MPa (2250 psi). The unique feature about the pressure seal bonnet is that the body - bonnet joints seals improves as the internal pressure in the valve increases, compared to other constructions where the increase in internal pressure tends to create leaks in the body-bonnet joint.

Gate valves normally have flanged ends which are drilled according to pipeline compatible flange dimensional standards. Gate valves are typically constructed from cast iron, cast carbon steel, gun metal, stainless steel, alloy steels, and forged steels.

Two recent contracts in China illustrate how waterworks and utilities are using butterfly valves  to reduce energy use.

These particular butterfly valves are massive, with a diameter in excess of 10 feet, and have a working life of 30 years. In total, the deal is worth more than $2.2 million.

The advanced sealing and flexible open technology properties of the valves make them more energy efficient, according to a press release.

NF’s Chairman and CEO, Li Gang, said that the energy efficient flow control system will help secure water supplies for the upcoming Asian Games in Guangzhou.

Butterfly valves require less depth of cover during installation, and thus less concrete required to cover the valve chamber, with an accompanying reduction of CO2 emissions.

In another example, NF is supplying six sets of butterfly valves to a coal plant under construction in Zhejiang province. That deal is worth $550,000.

The new coal plant is one of a breed of so-called ultra-supercritical power plants designed to replace smaller, inefficient and pollution-belching plants.

BEIJING, Jan. 26 /PRNewswire-Asia/ — Frbiz.com, one of China’s leading B2B search platforms, analyzes China valve industry trend.

Valves are a low margin product, while market competition is fierce. The more commonly used valves are those used in the water treatment industry, which is mainly based on low-pressure valve products, such as butterfly valves, gate valves and check valves.

At present in China, the domestic backbone enterprises have been able to produce valves according to ISO international standards, DIN German Standards, AWWA standards of the United States and other international standards for design and manufacture of a variety of valves, and some manufacturers’ products has even reached international advanced levels. Although the overall level of the Chinese valve industry has been greatly improved, the quality is still not stable enough. In addition, our ability to complete the valve as compared with the developed countries is still worse. How to deal with the valve industry market competition?

Generally speaking, China’s valve market prices are relatively stable. Although every year there are slight movements, the range is small.

Frbiz analyzes China’s valve market trends:

First, building just turned to large-scale development, and so there is a need of big diameter and high pressure safety valves and pressure reducing valves.

Second, energy development aspect is focused on energy saving, and from the perspective of energy saving there is a move to develop the steam water valves .

Third, urban construction also needs to turn to energy saving and environmental protection direction transition, before the general use of low- pressure valves, in particular, is an iron-only low-pressure valve, and now to the environment-friendly plastic sheet valve, balance valve, metal sealed butterfly valve as well as  the  transition to middle  sealing  butterfly valve, oil and gas  transmission  pipeline  projects  gradually developed as  the  need for more flat gate  valves  and ball  valves  increased.

Meet the faulty check valve, a little gremlin that lives inside the gas pump. It could be pilfering your pennies. Or it could be pilfering the gas station’s. It really doesn’t care. According to an AP article, a faulty check valve inside a gas pump is difficult to diagnose and often goes ignored. The pricing errors it produces could either be in favor of the gas station or the consumer. How does this work?

The check valve’s job is to sync the gas flow of gas with the start of the price meter. A faulty check valve might produce a 2-6 second delay before the gas starts pumping, an error in favor of the gas station. Conversely, a faulty check valve could also start pumping a few seconds before the meter starts, an error that benefits the customer. Unfortunately, check valves are difficult to diagnose and may often work sporadically.

So what can you do about faulty gas pumps? Try to keep track of how much gas your pump is actually pumping. If you see the price meter start several seconds before the gas flows, your pump may have a faulty check valve. Additionally, if you’ve put 11 gallons into your 10 gallon tank, it’s obvious that something is amiss. Report any discrepancies to the gas station. Some gas stations are authorized to give recompense if the discrepancy is within $5.00.Look for a phone number on the side of the pump which you can use to report any problems. Don’t forget about your local Department of Weights and Measures .

Saudi-based Abahsain Group said it has started work on a mechanical seal and valve plant in Dammam. The project is a joint-venture project with US-based Flowserve Corp and includes the manufacturing of control valves, ball valves, plug valves, butterfly valves and electric and pneumatic actuators for the oil and gas, petrochemical, power and water industries. The plant is expected to go into production by July 2010.