OmniSeal of Saint-Gobain seals is approved for use as static seals for rocket engines

Saint-Gobain Seals’ OmniSeal spring-energized blowout preventer has been certified as a static seal in aerospace industry rocket engine check valves.
A check valve is a flow control device that only allows pressurized fluid (liquid or gas) to flow in one direction. In normal operation, the check valve is in the closed position where the seal is secured by a static seal designed to withstand any blowout. Once the fluid pressure reaches or exceeds the rated threshold pressure, the valve opens and allows fluid to transfer from the high pressure side to the low pressure side. A pressure drop below the threshold pressure will cause the valve to return to its closed position. Check valves are also common in the oil and gas industry, as well as in pumps, chemical processing, and fluid transfer applications.
In most cases, design engineers will integrate check valves into their rocket engine designs. Therefore, the role of the seals in these trophies is crucial in the entire launch mission. An anti-leak seal is used in the check valve to keep high-pressure fluid on the high-pressure side while preventing the seal from spraying out of the housing. In the case of high pressure and rapid pressure changes across the sealing surface, it is very challenging to keep the seal in its housing. Once the dynamic sealing surface of the hardware detaches from the sealing lip, the seal has a tendency to be blown away from the housing due to the residual pressure around the seal. Normally, check valves use seat seals (simple PTFE blocks), but the performance of these seals is inconsistent, and over time, the seat seals will be permanently deformed, resulting in leakage.
Saint-Gobain Seals’ explosion-proof seals are derived from its OmniSeal 103A construction and consist of a polymer jacket with a spring energizer. The outer shell is made of proprietary Fluoroloy material, while the spring is made of stainless steel and Elgiloy® material. According to the working conditions of the check valve, a special process can be used to heat and clean the spring. The picture on the left shows an example of a conventional blowout preventer used by Saint-Gobain seals in a sealing rod application (note: this picture is different from the actual seal used in a check valve application, which is custom-designed). Seals in check valve applications can operate at low temperatures up to 575°F (302°C) and can withstand pressures up to 6,000 psi (414 bar).
The purpose of OmniSeal explosion-proof seals for rocket engine check valves is to seal pressurized gas and liquefied gas at temperatures below -300°F (-184°C) to 122°F (50°C). The pressure of the seal is close to 3,000 psi (207 bar). Fluoroloy® sheath material has excellent wear resistance, deformation resistance, low friction coefficient and extremely low temperature performance. OmniSeal® anti-leak seals are designed to perform hundreds of cycles of operation without leakage.
The OmniSeal® product line has a variety of designs, such as 103A, APS, Spring Ring II, 400A, RP II and RACO™ 1100A, as well as various custom designs. These designs include various fluorine material sealing sleeves and various configurations of springs. Saint-Gobain Seals’ sealing solutions have been used in launch vehicles such as Atlas V rocket engines (launching Mars Rover Curiosity into space), Delta IV Heavy rockets and Falcon 9 rockets. Their solutions are also used in other industries (oil and gas, automotive, life sciences, electronics and industry), as well as environmentally friendly industrial dyeing process equipment, chemical injection pumps, one of the world’s first subsea gas compression stations and chemical analyzers In the application of the class. .

Post time: Feb-25-2021

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