The pressure pump that is required to facilitate the filling and sizing of pipeline and prover spheres is a single acting, positive displacement, hand operated pump. The effective volume of the pressure pump should be approximately four cubic inches per stroke. The suction and discharge sides of a pump should be equipped with check valves, and a manual pressure relief valve on the discharge side. The suction side of the pump should be piped with standard ¼ inch IPS threads and a removable filling reservoir. The complete pump unit will include a pump, reservoir, filling hose with coupling, and a coupling adapter that will fit the sphere filling adapters.
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