Abstract: A pipe is provided for transporting a viscous fluid, including a pressure relief valve provided with a sealing element which separates the inside of the pipe from a discharge line and is designed to release the discharge line in the event of predetermined excess pressure. A surface of the sealing element, facing a Miler chamber of the pipe, is associated with the pipe in such a manner that the surface is flown around by a flow of the viscous fluid circulating through the pipe when in operation, and the sealing element is fixed in the closed position by a rod, the rod being displaced by the predetermined excess pressure such that the thus connected sealing element releases the discharge pipe.

Abstract: A control stop for a flush valve for a urinal or toilet fixture includes a housing defining a flow chamber divided by a valve seat into inlet and outlet sections. A valve structure is biased toward the valve seat by a spring applying a valve closing spring force. The housing is sealed by a diaphragm, and the diaphragm covers the movable valve structure, isolating it from water flowing through the housing. The diaphragm does not impede valve structure movement, and the closing spring force establishes a threshold water supply pressure for opening the control stop during increasing pressure following a no or low supply pressure condition. A plurality of control stops may supply a bank of flush valves and fixtures, and open in a cascading sequence during increasing pressure as a result of having springs with different closing spring forces.