The Advantages and Disadvantages of Pressure Control Valves

pressure control valve

Found in every hydraulic system, a pressure control valve assists in different functions like keeping the system pressure below a desired upper limit safely or maintaining a part of a circuit in a set pressure. The use of the control valve is to control the flow of the fluid by changing its size or its course depending on the signal from the controller. It is in controlling the rate of flow directly and help regulate the level or flow of the liquid, pressure, and the temperature. It is also called, in automatic control terminology, as the final control element.

Simply think that it is used to control the temperature, pressure, flow, and liquid level by closing it or opening it partially based on the received signals by the controllers. A pressure control valve regulating the opening and closing of the control valve is the pneumatic, hydraulic, and electric actuators while the one controlling the opening and closing of these actuators are the positioners.

The working process

The process plant comprises a lot of loops for control to deliver products with quality. These control loops already have their set temperature, pressure, and flow for the maintenance of the required operating range. The sensors and transmitters measure the internal disturbances in each of the control loops. The controllers will then decide what should be done to correct the disturbances of the load based on the collected information.

A controlling element is implemented after the collected data have been analysed, measured, and compared. This is the time when the control valve becomes useful to reduce disturbances. Think about the principle around the flowing fluid manipulation such as chemical compounds, gas or water to ensure that the load disturbance is minimised and the process variable is regulated to the closest value of the setpoint desired.

Categorization Values: Advantages and Disadvantages

Valves can either be classified as rotary or linear type based on the stem movement. It can also be based on the types of its offered services.

ON-OFF Services include the Gate, Diaphragm Ball, Plug, and Butterfly valves while THROTTLING Services include Globe, Diaphragm, Butterfly, Pinch. Check the valves for the NON-REVERSE FLOW.

GATE VALVES

Flat barrier makes up the Gate valve and is adjusted to have an effect on the area of flow. It is best to control the pressure and high temperature for liquid flow variety. It even has an on-off application. The design is used for the valves that manage the automatic emergency shut off and valves that are hand-operated.

The advantage of the gate valve is having a good closing feature and can be used in either way in the circuit. The loss of pressure is also minimal since it provides a laminar flow. Laminar flow is also known as the streamline flow that occurs when the fluid flows in parallel layers without disruption between them.

The disadvantages of this valve include opening and closing not being prompt, a large space is required when assembling, starting, and maintaining it. It is also prone to leakage when operated at high temperatures due to periodical fluctuations. The pressure control valve also creates vibration.

GLOBE VALVES

The shape of the pressure control valves looked like a globe and used for throttling. The valves have a stem that could adjust itself in an up-down motion to change the plug’s position. It also has a short stem with large pressure drop, capable of high seating, and high flow controllability.

The advantages of the globe valve include having a feature for good throttling and closing feature. It is also faster than gate valves when it comes to opening and closing time. It can also work as a stop check valve.

The disadvantages include the need for a larger torque actuator to close under high pressure. When compared to the gate valve it has a higher loss of pressure.

PLUG VALVES

Plug valve is made up of the cover, body, and plug that is used for the on-off services in the chemical industry, petrochemical, and refinery. It usually comes in a small size that requires less headroom. They provide a low-pressure drop, a tight shut-off, and a quick opening.

One good thing about it is having a simple and having just a few parts. It can also be repaired and maintained easily in the place of operation. It easily opens and closes and a leak-proof feature.

The disadvantage includes fast movement that creates high friction. This means requiring a large amount of force. It is also more expensive than the ball valves.

BALL VALVES

This valve is used to regulate the flow of the corrosive fluids, control the pressure, and control the pressure.

Advantages include having a very small dimension compared to gate valves with leak-proof services and a lightweight. It is reliable when it comes to providing services that are safe under high pressure and temperature.

The disadvantage of ball valves includes not being a solution for throttling permanently and can even cause abrasion and leakage. This is due to the collision of fluids that stick to the base.

DIAPHRAGM VALVES

This is used for fluids that are corrosive that is under low temperature and pressure conditions. Here the flow of resistance is varied by deforming a one surface using the force from the valve stem.

Advantages include keeping the parts that are working isolated from the process fluids. It is also easy to maintain and operate and can be used not only for opening and closing but also for throttling. It provides good resistance from chemicals and suits, radioactive fluids, and even chemicals, and other heavy chemicals.

The disadvantages include the operating temperature having limits based on the material of the diaphragm.

It is important to know about the advantages and disadvantages of the pressure control valve required for your industrial plants. The right kind of valves would bring lesser concerns or problems when you are using these valves.

 

Master Mac 2000 Logo

About MasterMac2000: Your Trusted Pneumatic & Process Automation Partner.

LEADING THE INDUSTRY: Established in 1989, MasterMac2000 has grown to become one of Australia's largest privately owned pneumatic and process automation companies. We stock top-quality brands like Univer, Mack, Tolomatic, Mac, Piab, American, and Rotoflux in Brisbane.

SERVING QLD & NORTHERN NSW: We proudly service Queensland and Northern New South Wales for all your pneumatic and process equipment needs. Our mission is to provide the best pre and post-sales support while actively expanding our client base.

SOURCING HARD-TO-FIND PARTS: Not only do we stock quality components, but we also excel at sourcing those elusive, hard-to-find parts. With our extensive database and global network of contacts, getting the parts you require is as easy as a call to our highly skilled, professional sales team.

DEDICATED TO YOUR SUCCESS:

  • Decades of expertise in pneumatics & process automation
  • Carefully curated selection of world-class brands
  • Exceptional sourcing capabilities for speciality parts
  • Knowledgeable sales staff dedicated to finding solutions
  • Unwavering commitment to customer service excellence


About The Author

Stuart Havill

Stuart Havill is the owner and manager of MasterMac2000, Queensland's largest privately owned pneumatic and process valve company.

With his early working career as a maintenance fitter for Boral in 1992, Stuart has spent his life in the field of pneumatics and process equipment. He gained extensive experience in plant design, maintenance, repairs, fabrication, and site management.

In 1996, he transitioned to a pneumatic sales technician role at MasterMac2000, where he excelled in key account management, providing cost-effective solutions, and managing a sales team of 9 employees.

Since 2002, Stuart has been the manager at MasterMac2000, overseeing the company's growth and establishing it as a leader in pneumatic automation and process valve engineering. His expertise spans customer training, CRM setup, industrial compressor sizing and installation, and turn-key project management.

Under Stuart's leadership, MasterMac2000 has been servicing the industry since 1988, with 5 full-time sales representatives covering northern rivers NSW, Queensland, Northern Territory, and PNG. The company prides itself on providing the best-priced solutions to all customers in the marketplace.

View Stuart’s LinkedIn profile to learn more about his expertise in pneumatics and process equipment.

Leave a Comment