We supply a wide range of valves for most industry needs. Browse our range of valve categories. Can’t find what you need please get in touch.
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. Large orifice air valves allow for the automatic ventilation of the pipeline during filling and emptying operations.
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.
Our dreadnought fig BDV blowdown valves are suitable for attachment to all types of boilers for continuous or intermittent use to drain dissolved solids from the boiler water. They are fitted with a stainless steel ball and reinforced PTFE seats with a quick quarter-turn action to open & close.
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.
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.
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.
Gauge Cocks are designed for connecting pressure gauges to a boiler or syphon. They are also suitable for connecting vacuum gauges.
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.
Named after their sharp needle-like disc and matching seat, needle valves design allows for precise throttle control in small piping systems.
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.
Penstocks provide an efficient and economical means of flow control in all open channels, dam walls or similar applications. They are an ideal choice for controlling flow in irrigation channels, water and sewerage treatment plants and flood control systems.
These simple and economical valves consist of cylindrical or conically-tapered plugs which can be rotated inside the valve body to control flow. The plugs in these valves have one or more hollow passageways going sideways through the plug, allowing flow when the valve is open.
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.
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.
These devices are used to discharge condensate and non-condensable gases with a negligible consumption or loss of live steam. Most steam traps are nothing more than automatic valves. They open, close or modulate automatically.
We are know for our new valve range, however we also have a limited range of reconditioned valves available. Each reconditioned valve is thoroughly restored and tested.
John Valves has a number of logistic partners. This allows for the shipping and handling of the smallest safety valves to the largest of gate valves. Our team can coordinate the pick and deliver of your valves for repair or reconditioning.
Australian valve manufacturer supply high quality valves to Australian and International Customers for over 120 years.
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