Double piston effect seats for ball valve

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Double Piston effect seats (as an alternative to the standard single piston effect seat), providing a contemporary seal at both the upstream and downstream sides. This system does not enable the automatic self-relieving of the excessive pressure in the body cavity, therefore it is necessary to use an external safety relief valve. Such a device can be avoided if at least one of the seats is of single piston effect type, but in such case the valve is unidirectional.

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