Sandwich valves

Sandwich valves

What is a sandwich valve?

This is a type of check valve that can be found in most oil wells. The check valve, also known as a pop-up valve or pressure relief valve, prevents oil from entering the well if the oil pressure is too high and prevents it from escaping if the pressure is low. Sandwich valves are typically installed at a depth of around 10 to 20 meters (33 to 66 feet) inside a well and are usually meant to isolate two different zones of the well – for instance, between the producing zone and the pump-down zone, so that no oil escapes from one zone into another. Check valves may have other applications as well, such as Within an oil refinery, Sandwich check valve control fluid flow in pipelines and may be used to isolate equipment for maintenance or repair work.

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Sandwich Valves Specification

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How often do sandwich ball valves fail?

In most cases, the sandwich ball valves in an oil rig’s production system will not fail. The Hydraulic sandwich valve is designed to handle a safe level of pressure, which is usually around 5 to 6 bar (60 to 70 psi) at the surface. At this pressure and temperature, the pressure limit for a ball valve is about 7 bar (100 psi). At higher pressures, a ball valve’s rubber sealing and metal parts can wear out and fail, causing it to leak and rupture from hydrostatic pressure build-up inside the valve. However, it is quite possible that other causes could cause a Sandwich butterfly valve to fail. For example, if a piece of equipment or product is blocking a ball valve, the valve can fail.

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What is a sandwich check valve used for?

A Sandwich gate valve is used to isolate two different zones of a well, or to isolate two separate production zones. If the pressure in a certain part of the well is higher than the pressure in another part, the valve separates the two parts of the well and prevents oil from escaping into the higher pressure zone. If the pressure in one zone is lower than the pressure in another zone, the Sandwich type valve separates the zones and prevents oil from entering the lower pressure zone.

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Can a sandwich butterfly valve control pressure?

Yes, a Sub sandwich valves can control pressure, but only if the pressure is less than the valve’s maximum rated pressure. If the pressure is higher than the valve can withstand, the Sandwich flow control valve does not control pressure, its effectiveness is limited to preventing oil from flowing back into the well. These are mounted with surfaces in connection with unidirectional flows and therefore can control the flow pressure.

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Does a sandwich gate valve prevent backflow?

Yes, a Sandwich ball valve prevents oil from flowing back into the well by closing a gate at the top of the valve. A gate valve can be used to maintain pressure in the well or shut off the oil flow completely. A gate valve can be used to isolate zones within a well or to isolate a portion of the well from the rest of the well. Sandwich type butterfly valve is installed into the system to prevent backflow in combination with directional valves.

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What is the purpose of a sandwich relief valve?

If a production well has a smaller diameter, a Sandwich type check valve of this type could be a good solution for keeping the well open. However, if the well has a larger diameter, a relief valve of this type could cause more problems than it solves. A relief valve is used to relieve pressure in a well, ensuring that no damage is caused to the well as a result of hydrostatic pressure build-up inside the well. If the pressure in the well is too high, a relief valve opens and allows the excess pressure to escape. Normally, a relief valve is installed at the end of a production well to relieve pressure in the well if drilling or production stops.