Technical info

Valve technical info in Ballarat

Globe valves

The flow path through globe valves follows a changing course thereby causing increased resistance to flow and considerable pressure drop. Because of seating arrangements globe valves are most suitable for throttling flow.

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.

Globe valves feature shorter disc travel. They are fewer turns required to operate globe valves and this saves considerable time, work and wear on valve parts.

While globe valves are not recommended when resistance to flow and pressure drop would be objectionable, they are generally ideal for throttling and preferable when a valve needs to be operated frequently.

Globe valve products

The Braemar T1M and T2 are low-cost bronze globe valves with screwed bonnets and integral seats for use in general purpose application areas requiring throttling control and isolation of flow such as hospital services, canteen equipment, agricultural instrumentation and general industrial applications. The seating faces of the disc and body may be easily reconditioned, if necessary, after extensive use.

Soft seat globe valves

The Braemar T101 and T102 bronze globe valves have union bonnets, renewable composition discs and integral seats. They are suitable for isolation duties on medium/low-pressure steam and hot water services and for regulation and isolation duties on cold water, air, oil, gas and other liquids not injurious to copper alloys. Application areas include hospital equipment, canteen appliances, heating systems and industrial processes, etc.

Stainless trim globe valves

The T501 & T502 Braemar globe valves feature a stainless steel disc and seat with precision lapped faces for easy inline refurbishment or replacement if necessary. The metal to metal locked up bonnet seal is designed for pressure tight sealing in service and, with a set screw, easy dismantling for maintenance purposes. The D.R. brass stem comes with accurately machined Acme threads. It features an effective and reliable stem sealing using non-asbestos packing in a substantial stuffing box.

Cast iron and steel globe valves

The Dreadnought Fig 1000 and 1100 cast iron and carbon steel globe valves are of simple, robust design and cover most applications within their specified working conditions. They are particularly suitable for steam installations, feed water services and on air services where the lower operating temperatures allow high pressures to be used.

Steel globe valve

The Dreadnought Fig T245 outside screw globe valves are designed for use on super-heated steam and for industrial applications. They are supplied as standard with a stellite-faced valve disc and body seat for high temperature, high-pressure service.

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Check valves

Sometimes referred to as non-return valves, the check valve prevents backflow down the pipeline to protect equipment downstream.

Swing check valve

Swing check valves work automatically in either horizontal or vertical (flow upward) pipelines. They must be installed with normal flow opening the disc, flow arrow indicates correct installation direction.

Lift check valve

Lift check valves also work automatically with line pressure in horizontal pipelines, but only with the bonnet vertically above the valve. The flow arrow on the side of the body indicates correct installation direction. Like a globe valve, with its indirect line of flow, lift check valves are flow restricting and therefore are generally used as a companion to globe valves.

Swing check valve products

The Braemar Fig T4B and T4BF bronze swing check valve fully conform to Australian standard AS 1628. This product has been designed for non-return duties in either horizontal or vertical pipelines, conveying water or other fluids not harmful to copper alloys. Suitable for applications in mechanical services, domestic water systems, fire protection, hospital equipment & general industry services within the pressure limitations.

Piston check valves

The Braemar Fig T521 and T522 bronze piston check valves, featuring a stainless steel disc and seat with precision lapped flat faces for easy inline refurbishment, or replacement if necessary. They feature a metal to metal, locked up bonnet seal designed for pressure tight sealing in service. The union nut bonnet connection allows easy dismantling for maintenance purposes.

Cast iron ball check valve

The BCK cast iron ball check valve features a non-clog design, minimum maintenance and trouble-free performance in the horizontal or vertical position. When the flow is stopped the back pressure forces the ball into a positive shut off position. The valve gives positive seating without the use of springs or other mechanical devices. This product is especially suited for sewerage applications but is equally suited for general water control.

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Gate valves

Gate valves are most commonly used in industrial piping to isolate flow rather than regulating it. They are used as stop valves to fully shut off or fully turn on flow, which is the only job gate valves are recommended for. Flow moves in a straight line and practically without resistance when the wedge is fully raised.

Seating is perpendicular to the line of flow, which is one reason why gate valves are impractical for throttling service and for frequent operation. Repeated movement of the wedge near the point of closure under high-velocity flow may create drag on the seating surfaces and cause galling or scoring on the downstream side. A slightly opened wedge may cause turbulent flow with vibration and chattering of the wedge.

Gate valves usually require more turns to fully open. Also, unlike many globe valves, the volume of flow through the valve does not directly relate to the number of turns of the hand wheel.

Since most gate valves have a wedge with matching tapered seats refacing or repairing of the seating faces is not a simple operation.

Gate valves, while not designed for throttling or too-frequent operation are generally ideal for services requiring full flow or no flow.

Screwed end gate valve

The T59 and T59M have an inside screw non-rising stem. Valves in all sizes are dezincification resistant. The valves are suitable for applications in mechanical services, domestic water systems, fire protection, hospital equipment & general industrial services within the pressure limitations. This product is not recommended for throttling and should be used in the fully open or fully closed position.

Flagged end gate valve

The T60 and T60M have a non-rising stem along with a screwed bonnet design, ideally suited for all mechanical fire service and plumbing installations, industrial, general water supply and domestic hot and cold services.

SG cast iron gate valves

The T600F Inside Screw and T601F OS&Y gate valves are used mainly for water control but are also suitable for general use on services such as oil, gas & mainly other fluids. They are solid wedge type with matching tapered body seats. These valves are manufactured in spheroidal graphite iron with bronze seats and wedge rings and stainless steel spindles.

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Ball valves

A ball valve is a valve with a spherical disc, which is the part of the valve which controls the flow through it. The sphere has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur. When the valve is closed, the hole is perpendicular to the ends of the valve and flow is blocked. The handle, or lever, will be in line with the port position letting you "see" the valve's position.

Ball valves are used extensively in industrial applications because they are very versatile and are easy to repair and operate.

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Butterfly valves

The butterfly valve derives its name from the wing-like action of the disc, which operates at right angles to the flow. Its main advantage is a seating surface which is not critical. The reason for this being the disc impinges against a resilient liner to provide bubble tightness with low operating torque.

The valves utilise elastomer seats and seals, they can be used in wide-open or fully closed positions, and in some cases can be used for non-critical throttling applications. They are lighter in weight than conventional valves. The position of their lever indicates whether they are wide-open, partially open or fully closed.

They are widely used in mechanical services as isolation valves on chilled and condenser water; the valves are designed so that lagging does not interfere with the valve operator.

The wafer type valve is designed for quick installation between flanges. No gaskets are required because of the moulded resilient liner which is keyed into a recess in both faces of the body ends.

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Knifegate valves

Knife gate valves are used to slice through sludge or sewerage. It is a great valve design that is distinguished from the standard design by the use of a simple metal plate for the gate and the absence of a bonnet, which is also called a slide valve.

The knife gate valve is a uni-directional or bi-directional valve designed for general industrial service applications. Knife gate valves used for pressure tight isolation of solid-liquid mixes in water and waste water treatment plants and pumping stations, paper and pulp plants, power plants and mining industry.

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Plug valves

Plug valves are cylindrical or conically-tapered plugs which can be rotated inside the valve body to control flow through the valve. The plugs in plug valves have one or more hollow passageways going sideways through the plug, so that fluid can flow through the plug when the valve is open. Plug valves are simple and often economical.

When the plug is conically-tapered, the stem or handle is typically attached to the larger diameter end of the plug. Plug valves usually do not have bonnets but often have the end of the plug with the handle exposed or mostly exposed to the outside.

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Needle valves

A needle valve has a relatively small orifice with a long tapered seat and a needle-shaped plunger on the end of a screw, which exactly fits this seat. As the screw is turned and the plunger is retracted, flow between the seat and the plunger is possible, however, until the plunger is completely retracted the fluid flow is significantly impeded. Since it takes many turns of the fine-threaded screw to retract the plunger, precise regulation of the flow rate is possible.

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Gauge cocks

The T73 Gauge Cocks are designed for connecting pressure gauges to boiler or syphon and also suitable for connecting vacuum gauges.

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Pressure reducers

A pressure reducer is a valve that cuts off the flow of a pipeline at any designated pressure to protect equipment and bring the flow to a safe, usable level.

When steam, air, water, gas or chemicals are to be used, boilers, pumps and compressors are often required to pressurise the system. Often the pressure generated by these systems are too high for the pipe work and equipment downstream which is why pressure reducers are used to create a consistent flow at a sustainable level.

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Penstock

Penstocks provide an efficient and economical means of flow control in all open channels, dam walls or similar applications. They are the correct choice for controlling flow in irrigation channels, water and sewerage treatment plants and flood control systems.

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Steam traps

A steam trap is a device used to discharge condensate and noncondensable 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. Others, like venturi traps, are based on turbulent 2-phase flows to obstruct the steam flow. The three important functions of steam traps are:
  • Discharge condensate as soon as it is formed.
  • Have negligible steam consumption.
  • Have the capability of discharging air and other non-condensable gases.

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Y-Strainers

Y-Strainers are designed to stop particles of dirt and pipe muck from passing through a pipeline and damaging sensitive equipment with minimum pressure drop.

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Safety/relief valves

The effects of exceeding safe pressure levels in an unprotected pressure vessel or system can have catastrophic effects on both plant and personnel. Safety relief valves should be used to protect any pressurised system from the effects of exceeding its design pressure limit.

A safety relief valve is designed to automatically discharge gas, vapour or liquid from any pressure containing system, preventing a predetermined safe pressure being exceeded to protect both plant and personnel.

Safety valve

This valve automatically discharges gases and vapours to prevent a predetermined safe pressure from being exceeded. It is characterised by a rapid full opening action and is used for steam, gases or vapour service. Safety valves will generally have an easing device so that pressure can also be relieved manually.

Relief valve

A valve which automatically discharges fluid (usually liquid) when a predetermined upstream pressure is exceeded. The term is commonly used for pressure relieving valves in which the lift is proportional to the increase in pressure above the set pressure. Relief valves usually have a closed cap with a tamper proof tag. All safety and relief valves come certified to AS1271

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Blow down valves

The Dreadnought Fig BDV Blow Down Valve is suitable for attachment to all types of boilers. These blowdown valves are fitted with a stainless steel ball and reinforced PTFE seats. They have a quick quarter turn action to open & close and are full bore. Valve keys are supplied with the valve as a standard.

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