Valve
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NINGBO ETDZ HOLDINGS LTD. is founded in 1986. It is developed in the year 2000 From NINGBO ETDZ IMP & EXP CORP with its predecessor NINGBO ECONOMIC TECHNOLOGY DEVELOPMENT ZONE IMPORT & EXPORT CORP. Through the years, the company changes the style from a single import & export enterprise to a diversity trade. Industry integrated group enterprise, and covers industries such as importing and exporting business, commodity business, cross-border e-commerce trade, international bidding, etc.
Complete range of products
Equipment legs, handles, floor drain, lampshades, electrode, infrared heating tube, beer keg, knob.
Wide market
USA, EU, Brail, Mexico, Japan, 30+ export country, $20.58million Annual output.
High quality
Real manufacturer with our own factory located. Strong professional technical team ensure to produce the top quality products. Good knowledge on different market can meet special requirements.
Any device for closing or modifying the passage through a pipe, outlet, inlet, or the like, in order to stop, allow, or control the flow of a fluid media.
Practically speaking, most valves have an inlet, an orifice or seat, a disk (or plug, seal etc.) that seals against the orifice, and an outlet. The inlet(s) and outlet(s) are also known as "ports."
The orifice seat and seal principle can be accomplished a number of ways, in fact, it seems that the valve industry is constantly inventing new ones. Perhaps the most common is the globe style valve, in which the seal moves to press against a "volcano" style orifice. Another common type is the ball valve, in which a ball with a hole through it is rotated within two seals. When the hole is aligned with the inlet and outlet, the valve is open. When the ball is turned, and the solid sides of the ball align with the inlet and outlet, the valve is closed. A plug valve is similar, it has a through hole in a cylindrical or conical shape instead of a ball.
At their most basic, valves are devices that work to control, regulate or direct flow within a system or process.
They often feature a range of characteristics that help to define their ideal application.
However, whether you're looking to control flow, provide safety in a system that is piping liquids, solids, gasses or anything in between, there are likely stainless steel valves available to help.
Valves provide several functions, including:
● Starting or stopping flow based on the valve state
● Regulating flow and pressure within a piping system
● Controlling the direction of flow within a piping system
● Throttling flow rates within a piping system
● Improving safety through relieving pressure or vacuum in a piping system
Advantages of Valves
Flow modulation: Valves allow for accurate control of fluid flow rates, regardless of the incoming pressure and temperature of the fluid. This is especially true in applications with varying process requirements or where multiple pipelines receive fluid from a single source. Valves also allow the flow rate to be adjusted up or down, depending on the required output.
Lower energy consumption: Valves help to conserve energy by maintaining a consistent flow rate, thereby reducing the overall energy consumption of a flow control system. The ability to regulate the fluid flow and pressure translates to lower pumping pressure, which, in turn, translates to a lower energy demand.
Process optimization: Valves are essential for optimizing process fluid control systems. They help maintain the ideal process fluid temperature, pressure, and volume, ensuring the industrial process is efficient and effective. This translates to better productivity and a smooth operation process to help companies meet their bottom-line goals.
Improved system longevity: Valves can help extend the lifespan of an industrial fluid control system since they regulate fluid flow rate and pressure through the piping. The consistent and accurate measurement of fluid flow translates to reduced wear and tear of the equipment, saving on repair time and expenses in the long run.
Valves in Action
Air or gas services
Compressed air systems, power tools, pneumatic control systems, and control valves for industrial gas storage and distribution systems use direct-acting and pilot-operated pressure reducing control valves for air and gas services. The type of pressure reducing control valve used for these services is determined by the level of control required.
Water services
Pressure reducing control valves are widely used in domestic and industrial water distribution systems and fire protection systems. For these services, direct-acting pressure reducing control valves are generally preferred.
Steam services
Most pressure reducing control valves are used in steam applications such as direct steam supply, engines, and turbines.
Other services
Additional services: Pressure reducing control valves are used in the following situations:
1. Heavy industrial equipment and rolling mill-bearing lubrication systems
2. To control ram pressure in hydraulic presses.
3. Pressure control in fuel-oil systems.
4. Pressure reduction is used in sterilizers, unit heaters, humidifiers, and in the small process equipment
5. Used extensively in fertilizers. Chemical process, and pharmaceuticals and natural gas distribution industry
Valve labeling
Valve labeling is important for identifying, classifying and finding valves easily. Valve Labels should be easy to read and understand so that anyone can identify the valve type and its purpose. There are many types of valves that are used in industries such as chemical plants, refineries, power plants, oil refineries, and water treatment plants. Choose the right labels for the industrial valves that suit your requirement.
Valve labels
Valve tags are preprinted with numbers and standard abbreviations to relay critical pipe content, valve identification, or operation information at the point of use. Valve tags include manufacturer information, valve seat, model number, trim, and body material.
Valve size
The valves in your plumbing system are the most important part of your system. They allow water to flow through your pipes and into your home or business. The valve pipe size is frequently specified in inches, but it may also be specified with a DN prefix. The DN number refers to the nominal diameter of the pipe in millimeters (mm).
Valve body
The valve body is an assembly inside the transmission that directs the flow of transmission fluid. It's made up of many valves, which open and close to direct fluid to different areas of the transmission. If a valve fails to work properly, it can cause your vehicle to shift hard or not at all.
Pressure class
"PN" stands for pressure nominal. The number following PN indicates the valve's pressure class in bars, where 1 bar equals 14.5038 PSI. Some manufacturers may also include the pressure rating in PSI. For example, a 4-way valve with PN16 is rated for 16 bar (250 PSI).
Factors to Consider When Choosing Valve
Operating pressure range: When selecting valves, it is crucial to consider the required operating pressure range. Ensure that the valve can handle the maximum and minimum pressure levels within the system to maintain optimal control and prevent damage or malfunction.
Flow rate and capacity requirements: Evaluate the flow rate and capacity requirements of the system to determine the appropriate valve size. Consider factors such as desired flow rate, maximum flow capacity, and any potential variations in flow conditions to select a valve that can effectively handle the required fluid volume.
Material compatibility and valve construction: Take into account the compatibility of the valve materials with the fluids or gases in the system. Consider factors like chemical compatibility, temperature resistance, and corrosion resistance to choose a valve constructed from materials that can withstand the operating conditions and maintain long-term reliability.
Environmental conditions and safety considerations: Assess the environmental conditions surrounding the valve, including temperature, humidity, and presence of hazardous substances. Additionally, consider safety considerations such as valve fail-safe mechanisms, compliance with industry standards, and the ability to handle potential system failures or emergencies.
What Are the Different Types of Valves
Gate Valve
Gate valves are the most common type of valves found in process plants. The closing gate moves along a linear path to block or allow fluid flow. Gate valves provide good shutoff and are considered suitable for almost all fluid services including air, fuel gas, feedwater, steam, slurries and viscous liquids.
Gate valves are inexpensive and easy to disassemble for maintenance. They offer low fluid resistance due to a straight path that allows the fluid to flow straight through without change in direction.
During use, gate valves are normally kept in either a fully open or a fully closed position as they are not recommended for throttling applications. The valve design makes it difficult to control the flow.
Globe Valve
A globe valve generally has a spherical body that contains a movable plug element and a stationary ring seat. The two halves of the body are separated by an internal baffle. The plug element is connected to an operating hand wheel through a stem. As the wheel is turned, the screw action moves the plug towards or away from the ring seat. Globe valves can be used for stop/start function as well as to regulate fluid flow. They are useful in applications where good flow control is desired and leak tightness is important such as cooling water systems, feedwater and chemical feed systems, and fuel/lubricating oil systems.
Globe valves cost more than gate valves but provide better shut off and throttling control. The design of these valves forces the fluid to change direction as it flows through; this creates high pressure loss and turbulence. Globe valves are generally heavier than other valves. They are not suitable for fluids containing particles, high viscosity fluids and other mediums that are prone to choking.
Ball Valve
A ball valve uses a hollow ball to stop or allow fluid flow. The perforated ball can be pivoted using the valve handle. When the hole in the ball faces the flow inlet, the fluid flows through. A quarter-turn rotary motion of the valve handle turns the ball by 90° blocking the flow.
Ball valves are smaller, lighter and cheaper when compared to gate valves of the same size and rating. They allow visual detection of the open or closed state of the valve. In an open state, the handle is aligned with the direction of flow; in a closed state the handle is perpendicular to the flow direction. In addition, ball valves offer ease of operation, high volume flow, high pressure, long service life and possibility of repair of seats and seals without removing the valve body from the line.
Check Valve/Non-return Valve
A check valve is used to prevent backflow in piping systems. The valve opens due to the pressure of the fluid passing through the pipeline. Reverse flow closes the valve and prevents the fluid from moving in the opposite direction. Check valves do not require external control. They work automatically and hence do not have an operating handle or stem. The simplest check valves are designed with a one-way flap mechanism.
Check valves are generally small, simple, and inexpensive. Industrial applications of check valves include feed water control systems, gas systems that mix multiple gases into a single gas stream, and fuel and oxidizer mixing systems. In domestic applications check valves are often used to prevent mixing of a sanitary potable water supply with water from unsanitary systems.
Plug Valve
Plug valves use a cylindrical or conically tapered plug to allow or restrict fluid flow. The plug has one or more hollow passageways that allow the fluid to pass through when the passage is aligned with the flow direction. A quarter-turn rotary motion is required to turn the plug and block the fluid flow. Plug valves perform well in slurry applications. The wiping action of the plug does not allow suspended particles to accumulate and form an obstruction. Typical applications of plug valves include gaseous, and vapor services, natural gas piping systems, oil piping systems, coal, mineral and sewage applications. They are also suitable for vacuum and high-pressure applications.
Plug valves offer a long service life and high reliability which makes them suitable for corrosive, abrasive, and toxic materials. They are usually used as on-off stop valves to provide quick bubble-tight shutoff. The valves can be repaired and cleaned without removal of the body from the piping system.
Butterfly Valve
The "butterfly" refers to a rotatable metal disc mounted on a rod. A quarter turn of the disc is required to open or shut-off the valve. In the closed position, the disk completely blocks off the passageway. In the open position, the face of the disc is parallel to the flow direction and allows nearly unrestricted fluid flow. Butterfly valves find applications in cooling water systems, compressed air or gas applications, fire protection, slurry services, vacuum service, and high-pressure / high-temperature water and steam services.
Butterfly valves have a short circular body which reduces space requirement and makes them light weight and easier to install. The compact design also makes them suitable for large valve applications. Butterfly valves have a high coefficient of flow. They offer good sealing even at low pressure.
Needle Valve
Needle valves are similar in design to globe valves. The plugging element in these valves is a long, tapered, needle-like plunger which fits into a matching seat to stop the flow. A stem is turned to insert or retracted the plunger, opening or restricting the flow path. The finely-threaded stem requires many turns to fully retract the plunger; this feature allows precise regulation of the flow rate. Needle valves are typically used in small diameter piping systems where very fine control of flow is desired. Needle valves are generally suitable for systems with low viscosity fluids flowing at low flow rates. The most common application is to regulate flow to fragile gauges in order to protect them from damage caused by an abrupt pressure surge. They are also used as bleed valves to relieve pressure or to drain off the fluid for analysis or for maintenance.
Pinch Valve
Pinch valves employ an elastic tubing and a pinching device that directly restricts the flow through the tubing. The pinching mechanism flattens the tubing to create a seal.
Pinch valves can be used to start, stop, and regulate fluid flow. Since these valves have fewer components, they are relatively cheaper and more leak-proof as compared to other valves. These valves are ideal for pneumatic conveying of solid materials and for handling of slurries. Pinch valves minimize turbulence and friction during flow.
Diaphragm Valve
A diaphragm valve, also known as a membrane valve, consists of an elastomeric diaphragm, and a saddle/seat upon which the diaphragm closes. A linear compressor is used to push the thin, flexible diaphragm into contact with the seat/saddle to close the valve. Diaphragm valves also allow partial closure of the passageway making them suitable for throttling applications. They are suitable for viscous fluids and fluids containing solid materials as the solids are not trapped in the valve mechanism. Diaphragm valves are commonly used in water treatment facilities, pharmaceutical, food and chemical plants, vacuum services and corrosive applications.
Diaphragm valves are leak-proof, easy to maintain, clean, safe, and effective. They are suitable for moderate pressure & temperature applications. The working temperature and pressures of diaphragm valves depend upon the diaphragm material.
Our Factory
NINGBO ETDZ HOLDINGS LTD. is founded in 1986. It is developed in the year 2000 From NINGBO ETDZ IMP & EXP CORP with its predecessor NINGBO ECONOMIC TECHNOLOGY DEVELOPMENT ZONE IMPORT & EXPORT CORP. Through the years, the company changes the style from a single import & export enterprise to a diversity trade. Industry integrated group enterprise, and covers industries such as importing and exporting business, commodity business, cross-border e-commerce trade, international bidding, etc.
Adhering to the people-oriented, guests first principle of integrity service.
The method of doing things carefully.
Our company has also been selected as "TOP 100 Enterprises in Ningbo service industry" for several years, and has "the competence for foreign contracting projects" which are determined by national Ministry of Commerce.
The trademark of "NBETDZ" has also been selected for "Ningbo export famous brand" and "Zhejiang export famous brand", and appraised as the AEO advanced certification enterprise of the customs. Our company was awarded the title of "Example Enterprise for Trade & Logistic" in Ningbo City and has been appraised as "The Pilot Enterprise for Ningbo Foreign Trade Supply Chain Management. And our company was awarded the title of "Ningbo city in the ten largest foreign trade enterprise innovation ", "Chinese export pilot index" sample enterprises by the General Administration of Customs.
In 2019, the company cooperated deeply with domestic customers and joined hands with the fortune 500 enterprises worldwide, with a total value of imported copper concentrate of 770 million yuan. In the whole year, the company achieved a total import & export volume of 2.058 billion yuan, ranked 52nd in Ningbo foreign trade enterprises, and was once again awarded the "Ningbo Shipper association vice president unit".
Our Certificate
ISO9001, ISO14001, ISO45001
FAQ
Q: What is a valve used for?
Q: What is a valve?
Practically speaking, most valves have an inlet, an orifice or seat, a disk (or plug, seal etc.) that seals against the orifice, and an outlet. The inlet(s) and outlet(s) are also known as "ports."
The orifice seat and seal principle can be accomplished a number of ways, in fact, it seems that the valve industry is constantly inventing new ones. Perhaps the most common is the globe style valve, in which the seal moves to press against a "volcano" style orifice. Another common type is the ball valve, in which a ball with a hole through it is rotated within two seals. When the hole is aligned with the inlet and outlet, the valve is open. When the ball is turned, and the solid sides of the ball align with the inlet and outlet, the valve is closed. A plug valve is similar, it has a through hole in a cylindrical or conical shape instead of a ball.
Q: Do I really need a valve?
Q: What is the purpose of a valve?
Q: What is the problem with the valve?
Q: At what psi do you need a valve?
Q: Does every house have a valve?
Q: Where do you install a valve?
Q: How do you know when a valve is bad?
Q: What is the life expectancy of a valve?
Q: How do I know if I need a valve?
Q: How to maintain a valve?
Check for broken or leaking pilot systems.
Check for air in the pilot system.
Clean dirty strainer screen.
Replace plugged fittings.
Test main valve diaphragm.
Check pilot diaphragm.
Perform pilot check.
Q: What are the two main responsibilities of a valve?
Q: What is the benefit of valve?
Q: What is the function of a valve?
Q: How does the valve work?
Q: Do valves fail open or closed?
Q: What is the purpose of using a valve?
Q: Can a valve cause a water hammer?
Q: What causes a valve to fail?
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