Are you looking for an established and trusted Australian manufacturer and supplier of mining valves? You’re in the right place! We provide reliable valve solutions for demanding mining applications across the country. Our engineers leverage our decades of research and experience in the mining industry to design cost-effective, long-term solutions for our customers.
Our high-quality mining valves are built to perform and withstand abrasive and corrosive media used in many refining processes.
John Valves Mining Valves
We provide a range of durable, cost-effective and industry-proven mining valves. Each valve is designed to help you prevent shutdown, protect people and the environment and meet industry compliance. We appreciate the uniqueness of every project. Thus, we also provide the option for custom-made speciality products to order.
These linear motion valves are used to stop, start and control the flow of fluid. Unlike the perpendicular seating in gate valves, globe valve seating is parallel to the line of flow. All contact between seat and disc ends when flow begins. This provides the valve with effective throttling ability for flow regulation.
The check valve, also known as a non-return valve, is used in piping systems to restrict and stop backflow. The fluid that passes through a pipeline creates pressure and flow velocity that opens the valve. On the flip side, the reversal of flow will cause the valve to close. There are a variety of valve types depending on the requirements of your system.
These types of valves, commonly used in process plants and water systems, are linear motion valves used to start or stop the flow of fluid or gas. In operation, gate valves are either completely open or completely closed. They allow for a minimal pressure drop as the fluid passes through the valve. This is due to the gate valve being removed from the flow when it is fully open, creating no resistance.
Gate valves, while not designed for throttling or too-frequent operation are generally ideal for services requiring full flow or no flow applications.
These valves work as safety devices, protecting pressurised equipment or systems during an overpressure event. If the pressure increases beyond what the equipment or piping system is designed to handle, damage can occur to the system itself, as well as personnel and property.
The primary purpose of safety and relief valves is to vent gas or fluid from a system that has become over pressurised, preventing the risk of damage and injury.
Air valves are designed for use in water systems and are available with either a small or large orifice. Valves can also be supplied with a combination of both a small and large orifice.
Small orifice air valves automatically release air that accumulates in pipelines during normal operation which can form large pockets of air at the high points in the piping system. These large pockets of air, if left to form, can seriously impede flow and result in increased pumping costs. Large orifice air valves on the other hand allow for the automatic ventilation of the pipeline during filling and emptying operations.
These valves derive their name from the wing-like action of their discs, which operates at right angles to the flow. The main advantages of a butterfly valve are low cost, quick operation, easy installation and light weight for size ratio.
These valves can be used in fully open or fully closed positions. They can also be used as a low cost way to control the flow of liquids or gases. However, they are not considered to be accurate control valves.
A ball valve is a valve with a spherical ball inside the valve body. The sphere has a hole through its middle so that, when in line with both ends of the valve, the flow will occur. When the valve is closed, the hole is perpendicular to the ends of the valve and flow is blocked.
Ball valves are used extensively in industrial applications due to their versatility and ease of repair and quick operation.
Parallel Slide Valves
These valves consist of two discs which maintain contact with the parallel body seats with a light spring. It uses line pressure to effect a tight closure. Temperature changes in the line are accommodated by the flexibility of the disc assembly and therefore do not affect the operation of the valve.
When being opened or closed, the discs slide across the seat faces, helping to remove any direct and foreign matter from the seating faces.
Level Control Valves
Level control valves are recommended for end-of-line service to keep water tanks full. They also eliminate the hammer and chatter associated with conventional ballcocks.
Knife Gate Valves
Knife gate valves are used to slice through sludge or sewerage. It is distinguished from the standard gate valve design by the use of a simple metal plate for the gate. They generally have a chamfer on the gate edge to help with cutting through product.
This uni-directional or bi-directional valve is used for pressure-tight isolation of solid-liquid mixes in general industrial service applications.
Pressure Reducing Valves
Sometimes the pressure generated by boiler, pump and compressor systems are too high for the process equipment downstream. Pressure reducing valves are used to create a consistent flow at a more suitable pressure level.
The purpose of these valves is to stop particles from passing through a pipeline and damaging sensitive equipment. They do this by employing a perforated mesh straining element.
The use of a y-strainer results in minimal pressure drop.
Your One Stop Valve Shop
Our trusted reconditioning and repair service is here to help you keep your equipment performing optimally. Our skilled team is equipped to recondition and repair a wide range of makes, types and sizes of valves. We do this with the knowledge, skills and experience we have acquired during our many years in business.