A fuel cell humidifier includes a membrane module accommodating a humidifying membrane, a first cap coupled to a first side of the membrane module and supplying a supply air to the humidifying membrane, and a second cap coupled to a second side of the membrane module and discharging a humidified supply air from the humidifying membrane to a cathode of a fuel cell stack. An exhaust gas inlet is coupled to the membrane module and provides an exhaust gas discharged from the stack and an exhaust gas outlet is coupled to the membrane module and discharges a dehumidified exhaust gas, which passes through the membrane module, to an exhaust system. A valve provides selective communication between a first region, where the supply air flows, including the first and second caps and a second region, where the exhaust gas flows, including the exhaust gas inlet and the exhaust gas outlet.

A supplementary mechanism that provides a temperature rise and fall effect to a machine tool spindle is mainly used to connect to pipelines between a machine tool spindle and a cooling device. The present invention provides an additional heating function to the spindle of the machine tool that originally has a cooling device, and still retains its original cooling function. The supplementary mechanism can provide the effect of raising and lowering the temperature. When cooling, the liquid provided by the cooling device is passed to directly cool the machine tool spindle. When raising the temperature, the flow path is switched, so that the liquid of the cooling device cannot flow to the machine tool spindle, and the liquid flowing out of the machine tool spindle forms an independent circulation channel, and the supplementary mechanism heats the liquid in the independent circulation channel, achieving the effect of rapid heating.

An inner subassembly for assembling a valve assembly includes a spool defining a central bore that extends axially through the spool forming a spool annular wall, and including a spool cone tip that is disposed at the first axial end, as well as a hydraulic activation ridge extending radially outwardly from the spool annular wall, and that is disposed axially between the second axial end and the first axial end. The spool may further define a first bypass bore. A stem defines a first flow bore that aligns with the first bypass bore.

Disclosed herein are systems comprising a pressure adjustment manifold, a pressure distribution manifold, and an electronic board, each of which are operatively connected. Also provided herein are methods of making and using the same.

A gas safety valve for controlling a gas flow includes a valve body providing a body inlet port for coupling to a first gas supply and a body outlet port for coupling to an appliance, the valve body extending along a longitudinal axis between the body inlet port and the body outlet port, the valve body further providing an inlet bore extending downstream from the body inlet port, and an outlet bore extending to the body outlet port. A valve has a valve chamber having a valve inlet and a valve outlet, a ball located within the valve chamber and a valve seat provided at the valve outlet such that the ball is retained in the valve chamber upstream of the valve seat. The valve body includes an internal junction positioned upstream of the valve inlet, and a side inlet port.

A fault-accommodating flow scheduling valve has a first inlet, outlet, and orifice therebetween. The valve has a shuttle valve member on the orifice inlet side, a primary valve member on the orifice outlet side, a compression-loaded primary spring, and first and second compression-loaded balance springs. Below a threshold differential pressure, the primary valve member engages with the outlet-side sealing face to close the valve while the shuttle valve member is spaced from the inlet-side sealing face, and on failure of the primary spring, the primary valve member moves from the outlet-side sealing face but the shuttle valve member closes the valve. Above the threshold differential pressure, the primary valve member opens the valve while the shuttle valve member remains spaced, and on failure of the primary spring, the primary valve member moves further from the outlet-side sealing face but the shuttle valve member closes the valve.

The operational performance of pumps can be improved when pumping liquids with at least 10 vol. % gas volume fraction (GVF) as found in many oil fields, wherein wells produce mixtures of gas and oil in varying proportions. An increase in the GVF that would have led to slugging in the flow, degrading the performance of pump in multiphase flow loop, and would have necessitated a check valve at each fluid stream to avoid flow reversal, can be overcome by a multiphase flow loop including a solenoid valve on the gas stream, which maintains the same intake gas pressure as that of oil/liquid pressure during the experiments. By testing pumps at more accurate GVFs, pump performance can be better assessed, resulting in reduced power consumption and increased efficiency.

Disclosed is a check valve and a modulator block including the same. An embodiment of the present disclosure provides a check valve comprising a valve housing including first and second internal flow passages each formed to pass through an interior of the valve housing and having an inlet through which a fluid is introduced and an outlet through which the fluid is discharged; a first opening and closing member provided in the first internal flow passage and opened and closed by a hydraulic pressure of the fluid; a second opening and closing member provided in the second internal flow passage and opened and closed by the hydraulic pressure of the fluid; and a stopper member press-fitted to the valve housing.

There is provided a valve apparatus. The valve apparatus includes a body, a closure member, upstream and downstream compartments, a closure member passage, a first fluid pressure-receiving surface fraction and a second fluid pressure-receiving surface fraction. The body includes an inlet port, a first outlet port, and a second outlet port. The closure member is configured for movement between an open position and a closed position. In the open position, the first outlet port is open. In the closed position, the first outlet port is closed. While the fluid pressure within an upstream compartment is equal to the fluid pressure within a downstream compartment, the closure member is biased to the closed position.

A fluid end comprising a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section is releasably attached to a connect plate. Each connect plate is attached to a power source using a plurality of stay rods. Each fluid end section comprises a housing in fluid communication with a pair of intake manifolds and a discharge conduit. A fluid routing plug is installed within each housing and is configured to route fluid throughout the housing. A plunger is installed within stuffing box attached to each housing. A number of features, including the location of seals within bore walls and carbide inserts within valve guides, aid in reducing or transferring wear.