When an ORBIT valve begins to open, the core tilts away from the seat and line flow passes around the core face. This eliminates localized high velocity flow that typically creates uneven seat wear and a reduced valve life.

A plug valve uses a tapered or cylindrical plug to stop or start a flow. In open position, the plug-passage is in one line with the inlet and outlet ports. If the plugis rotated from the open position, the solid part of the plug blocks the port and stops the flow.

Old stylegas shut off valves

When turned open, the disc of the gate is completely removed allowing contents to pass. Although this gives the valve good shut-off properties and is bidirectional, they cannot be quickly opened or closed and are sensitive to vibration when open.

Mainly used for air, gases and liquids, ball valves are quick to turn on and off and have a tight sealing with low torque. The only downside to these valves are the lack of throttling properties available.

For flows over easily eroded soils, whether they are bare or vegetated, reduce velocities by 20% (that is, multiply suggested velocity by 0.80).

The slight disadvantages of the globe are that they perform unfavourably when high pressure drops, and require greater force or throttling flow under the seat to shut off valve.

Acronyms for ‘Automatic Recirculation Valve’ and ‘Automatic Recirculation Control’, these valves are multi-functional but has the primary purpose of ensuring that a pre-determined minimum flow is assured through centrifugal pump at all times.

As centrifugal pumps consistently suffer from being over heated, its important to keep the minimum flow otherwise dry valves means permanent damage.

Different types of gas shut off valvespdf

Note: this information is a general guide, and local conditions need to be assessed before designing surface water management structures. Managers should use specialist advice for their site.

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Naturalgas shut offvalve

These are quick to turn off, smaller in size compared to most valves and has minimal resistance flow. However, they do have a reduced port due to tapered plugs and a requires a large force to actuate, due to high friction.

2Coarse gravel is less than 60mm in diameter. A clay loam and coarse gravel mix is unlikely to form very good grass cover.

Gas shut offvalve outside house

Pressure and vacuum protection levels are usually controlled with weighted pallets and can be combined to meet the required settings. This valve must be used in accordance with the American Petroleum Institute’s API standard 2000 for venting atmospheric and low pressure storage tanks.

The balls are generally made out of several metallics whilst the seats are made from soft materials like Teflon. The combination of materials means the ball valve can operate at temperatures as low as -200 deg C and as high as 500 deg C.

Every ORBIT valve incorporates a tilt and turn operation that eliminates seal rubbing, which is a primary cause of valve failure. When an ORBIT valve is closed, the core is mechanically wedged tightly against the seat assuring a positive shut off.

Different types of gas shut off valvesdiagram

As well as being lightweight, and quick to use, the butterfly valves are available in large sizes and can cope with low-pressure drop and high-pressure recovery.

Adopted for valves for high pressure service, pressure seal valves are typically used in excess of 170 bar. The unique feature about the pressure seal ‘bonnet’ is that the body’s joints seals improve as the internal pressure increases.

Traditionally made from stainless steel, they are most commonly used in conjunction with gate or globe designs due to their internal construction and axial movement of the valve stem.

Conventionally used for isolation and throttling services, the globe has become the world’s most common types of valves. With a good shut off ability, available in tee, wye and angle patterns and easy to machine the valve seats – its easy to see why they are so popular.

Gate valves are primarily designed to start or stop a flow when a straight line flow of fluid and minimum flow restriction are needed. In service, these valves are pretty much kept either fully open, or fully closed.

Gasvalvetypes

Typically used for cooling water systems, transporting fuel oil and turbine lube oil systems, a globe valve is a linear motion valve used to stop, start and regulate flow.

Also known as vacuum relief valves, breather valves are a special type of relief valve designed for tank protection. The valves prevent the build up of excessive pressure or vacuum which can unbalance the system or damage the storage vessel.

CookingGasValve

Valves are essential parts of any piping system used to control the flow and pressure of contents, whether that is oil, gas, liquid, or vapors. Here is our list of 10 of the most commonly used types of valves used in the oil and gas industry and the reasons for their existence, with details from Wermac:

Different types of valvesused in oil andgasindustry pdf

The table below provides suggested maximum velocities of surface water flow on various soils. This information can be used when designing surface water management structures.

The welded versions are made by welding washer-like plates of thin metal together at both the inner and outer circumference of the washers.

There are two main types of bellow, the forged and the welded versions. Forged bellows are usually made from a thin wall of foil in a tube which is then longitudinally fusion welded.

Where grass cover is very good and suitable groundcover can be maintained, water velocities can exceed 1.5 metres per second (m/s). See Table 1.

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The Department of Primary Industries and Regional Development recommends using professional advice to design surface water management structures.

A ball valve is a quarter-turn rotational motion valve that used a ball-shaped disk to control a flow. If the valve is opened, the holes in the ball stay in line with the body inlet allowing contents to pass.

This simplifies the operation of the valve, but at the expense of speed. These valves must also be installed a minimum of 6 pipe diameters away from other line elements.

Obviously there are many more types of valves that are used within the industry, but is important for any oil and gas engineer to know the basic valves, the principals, and what they should be used for.

A quarter-turn rotational motion valve, the butterfly valves is used to stop, start and regulate flow. Easy and fast to open, the valve usually comes equipt with a gearbox where the hand wheel by gear is connected to they stem.