Blocking Valves – A Different Sort of Pneumatic Valves

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Blocking valves are pneumatic valves of any type used to close off any kind of flow. These flows can be through a pipeline or out of a tank. Such valves used in blocking include gate valves, ball valves, and plug valves. A blocking valve can be locked in either the closed or open position to prevent incidents of vandalism and tampering.

Main characteristics of blocking valves

Blocking valves are offered in different configurations by various vendors (the best being from Mack Valves Pty Ltd, distributed by Master Mac 2000 in Brisbane), and they can be constructed from different materials. The valve’s body is usually with several diaphragms mechanically integrated into one body. 

An important detail about blocking valves is that this term is not their official classification. On the other hand, it is merely a broad description of several types of valves that are designed to block flow.

The advantages of blocking valves are that the flow path includes lower internal volumes and a significant reduction of the piping needed in a process system. Valve components for single diaphragm valves and blocking valves are virtually the same. Service and spare parts are primarily the same for both types of valves.

Types of block valves

  • Ball valves – The most common type of blocking valve, especially for PVC application. This type is commonly used to totally turn on or off any flow in a system using spherical seating with a hole in it. This hole allows the liquid to flow when the valve is opened.
  • Gate valves – This valve has a flat vertical gate that stops liquids dead on. The design of standard gate valves makes it much more effective as a shutoff valve than as a control valve. When a gate valve is opened, the gate is entirely out of the way in a full-bore configuration. Thus, when the valve is open, flow goes unrestricted. 
  • Pinch valves – This valve can operate as a stop valve or limiting valve. The valve has a tube inside that is squeezed closed or left open – partially or fully – and works more effectively even when partially opened. 

Master Mac 2000 

Master Mac 2000 is the sole authorised distributor in Australia of pneumatic valves for Mack Valves in Northern New South Wales and Queensland. We also provide unprecedented technical support from our head office and warehouse in Brisbane before and even after you purchase your valves or cylinders for a specific industrial need. Mack Valves are proudly made in Australia and is a brand well-known in-country and globally for its reliability and longevity. Find our Mack Valves in our Master Mac 2000 site or call us at 07 3344 4711.

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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.


  • 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.

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