The invention provides a pressure reducing valve in which a minimum pressure can be secured even when an engine speed is reduced.BALANCING VALVES A pressure reducing valve changing an output pressure in correspondence to an engine speed has means for outputting a predetermined minimum pressure when the engine speed is equal to or less than a first predetermined rotational speed. Reducing ValvesA variable pressure reducing device for reducing high pressure in steam and hot water samples forces the liquid through an annular passageway between a pair of rods within a complementary pair of tubes. The flow rate through the rod-in-tube device,Bellows Seal Valves or the pressure drop across the device, is adjustable by means of a rotatable guide screw for adjusting the position of the rods within the tubes. The rods are tapered to provide a smooth flow of liquid through the device. The seal around the guide screw is self energized by means of a seal jacket between a valve gland and a stem portion of the guide screw constructed so that the biasing force of a spring on the seal jacket is supplemented by pressure from liquid flowing through the device. The guide screw is centered within the valve gland to keep the guide screw properly aligned, particularly when the device is used with a motor for rotating the guide screw to adjust the position of the rods.

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