Factors to Consider When Choosing Valve Suppliers - LinkedIn
Factors to Consider When Choosing Valve Suppliers - LinkedIn
Industrial valves are crucial to the safe and effective operation of numerous systems in manufacturing, oil and gas, chemical processing, and more. These valves are essential to intricate industrial processes because they regulate the flow of liquids, gases, and other molecules.
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However, selecting certified and experienced valve suppliers is crucial to ensuring the dependability and lifespan of these systems. This article will explore the essential elements when choosing valve suppliers to guarantee smooth operations and reduce potential dangers.
What are the Characteristics of an Inexperienced Valve Supplier?
1. Unfamiliar with Market Trends:
The most recent developments, inventions, and market trends in the valve sector might not be known to inexperienced valve vendors. As a result, they might provide out-of-date items that need to address the changing demands of the industrial sector.
Working with vendors who keep up with technical advancements and modify their product lines is essential.
2. Unclear Company and Product Positioning:
The lack of distinct company and product positioning may indicate that the supplier needs a clear strategy. This may result in product quality, cost, and customer service consistency. A focused and transparent supplier in their operations will provide dependable, uniform valve goods.
3. Subpar Product Quality:
The quality of valves directly influences the effectiveness and safety of industrial processes. Inexperienced vendors may sacrifice quality to offer lower pricing, resulting in more frequent failures and higher maintenance expenses.
Choose trusted suppliers with a track record of supplying high-quality valves to avoid operational hiccups and safety risks.
4. Inability to Meet Rapid Response Needs:
Especially during emergencies or unforeseen breakdowns, industrial operations frequently necessitate swift responses to urgent procurement needs.
A new valve supplier needs help offering prompt solutions, resulting in expensive system downtime. Maintaining efficient operations requires assessing a supplier's capacity to meet quick response requirements.
5. Outdated Technology:
The effectiveness of industrial operations can be significantly hampered by outmoded valve technology in today's world of quickly changing technology.
A beginner provider needs more technical know-how to offer cutting-edge, creative valve solutions. To provide advanced products, it is essential to collaborate with suppliers who make research and development investments.
How to Select Stable and Reliable Suppliers?
1. Establish a Complete Supplier Evaluation Programmed Documentation System:
Companies should develop a thorough evaluation strategy to ensure a logical approach to choosing valve suppliers. Criteria, including supplier experience, financial stability, references, and historical performance, ought to be part of this system.
A structured evaluation procedure makes it possible to make decisions consistently and aids in finding the best suppliers.
2. Consider the Supplier's Technical Capabilities and Quality Certification:
An essential component of a trustworthy valve provider is technical knowledge. Analyze the supplier's engineering expertise, production methods, and quality assurance practices.
To assure their products' quality and dependability, ensure the supplier complies with industry standards and carries the necessary certifications, such as ISO certificates.
Here's a list of steps to help you evaluate suppliers effectively:
a. Specify your needs: Clearly state the items or services you need, including any necessary technical specifications and quality criteria. This will act as a benchmark for assessing possible vendors.
b. Research prospective suppliers: Find vendors with a track record of providing high-caliber goods or services. Industry associations, trade exhibitions, online directories, and personal recommendations can all be excellent information sources.
c. Review the supplier's portfolio: Examine the supplier's past work or track record to determine whether they have solutions matching your requirements. Look for case studies, endorsements, and client reviews.
d. Evaluate the manufacturing processes: Learn about the supplier's manufacturing processes, including the equipment used, the production techniques, and the quality control procedures. You can better comprehend their abilities and effectiveness by doing this.
e. Request product samples: Sometimes, you should ask for samples of the goods you plan to buy. Examine the effectiveness, dependability, and conformity to your requirements.
f. Verify the supplier's quality certifications: Check certifications such as ISO (Quality Management System) or ISO (Environmental Management System) to see if they are current. These certificates demonstrate the supplier's use of quality control procedures and compliance with global standards.
g. Assess technical expertise: Examine the technical team of the supplier's qualifications, experience, and subject matter knowledge. Better product development and support can result from a talented and knowledgeable staff.
h. Site visits and audits: Inspect the supplier's facilities on-site. This will allow you to observe how they operate firsthand and gauge their ability to fulfill your needs. You can also perform audits to ensure they adhere to quality standards.
i. Check the supplier's references: by asking for testimonials from current or former customers. Contact them to learn more about these people's opinions of the supplier's goods and services.
j. Financial security: Make sure the provider has a solid financial foundation. A financially stable provider is less likely to have unforeseen interruptions in production or service.
k. Quality and delivery history: Find out how the supplier has performed regarding product quality and delivery schedules. For a provider to be trusted, they must consistently fulfill deadlines and uphold quality standards.
l. Supply chain management: Assess the supplier's supply chain management procedures, including their capacity to procure raw materials, manage logistics, and handle potential hiccups.
m. Capacity and Scalability: Check the supplier's capacity and scalability to see if they can satisfy your present and future demands. Without sacrificing quality, a scalable provider can adjust to your changing needs.
n. Communication and responsiveness: Evaluate the supplier's effective communication and responsiveness capability. For a successful professional partnership, effective communication is essential.
o. Conduct a risk assessment: to determine if the supplier poses any dangers. Consider factors like the supplier's location, political stability, or reliance on a single provider. To reduce these risks, create backup strategies.
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3. Examine the Supplier's Service and Supply Timeliness:
Customer service that is effective and timely is essential when working with valve suppliers. Examine their means of contact, receptivity to questions, and readiness to offer assistance during and after the procurement process. Consider their supply timeliness to ensure they can deliver valves on time and per your needs.
4. Examine the One-Stop Supply Capability:
Working with a vendor who provides a variety of valve sizes and kinds helps streamline the purchasing process and possibly results in cost savings.
By eliminating the need to work with different vendors, a one-stop supply capability makes it possible to get valves, replacement parts, and related services in a more organized manner.
Summary
A qualified valve provider is essential for industrial processes to run smoothly and safely. An inexperienced supplier could jeopardize technical breakthroughs, service effectiveness, and product quality, resulting in operational hiccups and safety hazards. Companies should implement a strict evaluation procedure, considering technological capabilities, quality certification, responsiveness of service, and one-stop supply capabilities, to prevent these dangers.
Dombor is a well-known example of a trustworthy provider in the valve sector. We have a reputation for providing high-quality valves that adhere to industry requirements. Our dedication to innovation guarantees that their goods keep up with the most recent technological developments, making them a reliable partner for various industrial applications.
A Guide to Flow Control Valves Types and Use Cases
Flow control is an important aspect of hydraulic system designs as it is used to regulate speed. Various types of flow control valves and other devices can be used which enables the speed of an actuator to be controlled by regulating the hydraulic system's flow rate.
Flow rate also determines rate of energy transfer at any given pressure. The two are related in that the actuator force multiplied by the distance through which it moves (stroke) equals the work done on the load. The energy transferred must also equal the work done. Actuator speed determines the rate of energy transfer (i.e., horsepower), and speed is thus a function of flow rate.
Directional control, on the other hand, does not deal primarily with energy control, but rather with directing the energy transfer system to the proper place in the system at the proper time. Directional control valves can be thought of as fluid switches that make the desired "contacts." That is, they direct the high-energy input stream to the actuator inlet and provide a return path for the lower-energy oil.
It is of little consequence to control the energy transfer of the system through pressure and flow controls if the flow stream does not arrive at the right place at the right time. Thus, a secondary function of directional control devices might be defined as the timing of cycle events. Because fluid flow often can be throttled in directional-control valves, some measure of flow rate or pressure control can also be achieved with them.
Different Types of Flow Measurement
Controlling flow of a hydraulic system does not necessarily mean regulating volume per unit of time from a valve. Flow rate can be specified three different ways, so it is important to be aware of how flow is to be specified or measured:
Because they control the quantity of fluid that flows through the valve per unit of time, the same control valves are used for all three types of flow rates.
Control of Flow Rate with Valves
There are eight types of flow control valves which are used most often in hydraulic circuits.
Orifices
A simple orifice in the line, shown in Figure 1 (a) below, is the most elementary method for controlling flow. (Note that this is also a basic pressure control device.) When used to control flow, the orifice is placed in series with the pump. An orifice can be a drilled hole in a fitting, in which case it is fixed; or it may be a calibrated needle valve, in which case it functions as a variable orifice, Figure 1 (b). Both types are non-compensated flow control devices.
Rotary Flow Dividers
Another technique for dividing one input flow into proportional, multiple-branch output flows is using a rotary flow divider. It consists of several hydraulic motors connected together mechanically by a common shaft. One input fluid stream is split into as many output streams as there are motor sections in the flow divider. Because all motor sections turn at the same speed, output stream flow rates are proportional and equal to the sum of displacements of all the motor sections. Rotary flow dividers can usually handle larger flows than flow divider valves.
The pressure drop across each motor section is relatively small because no energy is delivered to an external load, as is the usual case with a hydraulic motor. However, designers should be aware of pressure intensification generated by a rotary flow divider. If, for any reason, load pressure in one or more branches drops to some lower level or to zero, full differential pressure will be applied across the motor section in each particular branch. The sections thus pressurized will act as hydraulic motors and drive the remaining section(s) as a pump(s). This results in higher (intensified) pressure in these circuit branches.
When specifying rotary flow dividers, system designers must be careful to minimize the potential for pressure intensification. A pressure relief valve should be placed in any actuator fluid line where this condition may occur. Rotary flow dividers can also integrate multiple branch return flows into a single return flow.
Read more about flow dividers.
Proportional Flow-Control Valves
Proportional flow control valves combine state-of-the-art hydraulic valve actuation with modern, sophisticated electronic control. These valves help simplify hydraulic circuitry by reducing the number of components a system may require while, at the same time, substantially increasing system accuracy and efficiency.
An electronically controlled, proportional flow control valve modulates fluid flow in proportion to the input current it receives. The valves can easily control cylinders or smaller hydraulic motors in applications that require precise speed control or controlled acceleration or deceleration. Most proportional flow-control valves are pressure compensated to minimize flow variations caused by changes in inlet or outlet pressure.
An electrohydraulic proportional valve consists of three main elements:
- a pilot or proportional solenoid
- a metering area (where the valve spool is located), and
- an electronic position-feedback device, often an LVDT (linear variable differential transformer).
Valve operation begins when it receives a signal from an outside controlling device such as a computer, programmable logic controller (PLC), traditional logic relay, or potentiometer. The control device delivers analog electrical signals to the valve driver card, which, in turn, sends a current signal to the solenoid on the valve.
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The electromechanical force on the spool causes it to shift, gradually opening a flow path from the pump to the actuator port. The greater the command input signal, the greater the current to the valve solenoid, and, thus, the higher the flow from the valve. The important feature of this proportional valve is that all elements are proportional; thus, any change in input current changes force signals proportionately as well as the distance the valve spool will shift, the size of the flow path, the amount of fluid flowing through the valve, and finally the speed at which the actuator moves.
As the spool shifts, its motion is detected and monitored very accurately by an LVDT or other type of position-feedback transducer. This signal is fed back to the driver card where it is continuously compared with the input signals from the controller. If the two differ, the driver adjusts spool position until the two signals match.
Pressure-compensated proportional flow control valves are 2-port valves in which the main control orifice is adjusted electronically. Similar to conventional pressure-compensated flow control valves, a proportional version maintains constant flow output by keeping the pressure drop constant across the main control orifice. The proportional valve, however, is different in that the control orifice is modified to work in conjunction with a stroke controlled solenoid.
In a 2-port, pressure-compensated proportional flow control valve, an electrically adjustable control orifice is connected in series with a pressure reducing valve spool, known as a compensator, shown below in Figure 11. The compensator is located upstream of the main control orifice and is held open by a light spring. When there is no input signal to the solenoid, the light spring force holds the main control orifice closed. When the solenoid is energized, the solenoid pin acts directly on the control orifice, moving it downward against the spring to open the valve and allow oil to flow from port A to port B.
When an electrical signal is fed into an electronic amplifier, the solenoid and controller adjust the pilot pressure supplied from port A to change spool position. An LVDT then feeds back the position to the amplifier to maintain the desired orifice condition for flow from port A to port B. The proportional logic valve is available with either linear or progressive flow characteristics, and the valve drivers respond to voltage (0-10V DC) or current (0-20 mA) command signals. The typical valve amplifier card requires a 24V DC power supply.
Because the valve remains relatively unaffected by changes in system pressure, it can open and close the orifice in the same length of time. This maximum time can be changed on the amplifier card by adjusting a built-in ramp generator.
The amplifier can be used in several ways. An external electronic control can make the orifice remotely adjustable while maximum spool acceleration is still limited by this internal ramp; or a switch can be added to turn the ramp on and off. In case of power failure, the element will return to its normally closed position.
Determining the best type of flow control valve to use depends on the design parameters of the application. The table below provides general guidelines based on common application characteristics.
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Which Flow Control Valve to use for an Application ApplicationType of Flow Control Valve Load on the actuator and supply pressure both are constant: ±5% accuracy Non-compensated, fixed or variable flow control, depending on application Load on the actuator, supply pressure, or both undergo changes: ±3-5% accuracy Pressure-compensated, fixed or variable flow control, depending on application Load on the actuator, supply pressure, or both change, and fluid temperature varies ±30° F (±17° C): ±3-5% accuracy Pressure- and temperature-compensated, fixed or variable flow control