FIELD: oil producing industry; applicable in pressure control in well flow of liquid or gas at wellhead. SUBSTANCE: wellhead pressure controller includes body with bellows chamber, rod and seat. Inlet channels are communicated with upper point of tubings and outlet channels are communicated with system of oil gathering system. Flow area of inlet channels is larger than total cross-section area of outlet channels. Rated pressure is attained in upper point of tubings. Bellows chamber contracts and seat flow area opens, and well fluid outflows. EFFECT: higher efficiency of device operation. 2 dwg
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