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.

A vacuum system non-return valve includes a baffle for extending across a flow path in the vacuum system and a valve member. The baffle has an aperture, a perimeter of the aperture has a valve seat. The valve member has a curved sealing surface configured to mate with the valve seat. The valve member and aperture are configured such that the valve member obscures the aperture and seals with the valve seat to impede a flow of fluid in a closed position and is displaceable in use to move away from the valve seat and allow a fluid flow in an open position; at least a portion of the surface of the baffle surrounding the aperture slopes towards the inlet end of the valve such that the aperture is smaller at the inlet end than it is at the outlet end.

The disclosure relates to a valve assembly, comprising a valve body, in which a fluid channel is formed that connects a fluid inlet to a fluid outlet, wherein a preload force is applied to a closing body, which is movably mounted in the fluid channel, in the direction of a valve seat formed in the valve body, a fluid force acting on the closing body against the preload force in order to open the valve seat. The closing body is guided axially and/or radially by at least one guide ball, the guide ball being arranged between the closing body and a lateral boundary of the fluid channel.

A piston pump includes: a sleeve housing which is provided with a discharge hole and defines a bore; a piston which has an inlet flow passage for drawing oil into the bore and is reciprocally movably inserted into the bore; an inlet valve which is configured to open/close the inlet flow passage; an outlet valve cover which is coupled to the sleeve housing to surround a portion at which the discharge hole is formed; an outlet valve which is configured to open/close the discharge hole; and a sealing member which is interposed between the sleeve housing and the piston to provide a sealing therebetween. The sealing member is provided with a separation prevention protrusion against which the piston is blocked to prevent a separation of the piston.

A valve includes a housing, a first ball, a second ball, and a deflector plate. The housing defines an inner chamber and has an inlet and an outlet providing fluid communication into the inner chamber. A longitudinal axis extends between the inlet and outlet. The first ball is disposed in the inner chamber between the inlet and outlet and rests on a seat extending into the inner chamber. The second ball is disposed in the inner chamber between the first ball and outlet and rests on the first ball. The deflector plate is disposed in the inner chamber and positioned between the inlet and first ball. The first ball, second ball, and deflector plate are aligned so that their centers lie on the longitudinal axis. The deflector plate is configured to deflect gas entering through the inlet to prevent the gas from driving the first and second balls upward.

Systems and methods for sealing bolted flange joints to stop or prevent leakage are disclosed. The system includes a sealant injection nut. The sealant injection nut generally comprises a threaded nut configured to be threaded onto a stud bolt of a flange joint. The nut is configured to inject sealant into the internal passages of the flange joint. The nut includes a passageway drilled through the sidewall. Fitted to the passageway is a high-pressure sealant-compatible injection fitting and an internal check-valve. Provided within the central cavity of the nut, at the flange-facing end, is a groove that facilitates the flow of sealant injected through the passageway into the passages of the bolted flange. A method is also provided for manufacturing the sealant injection nut. A method is also provided for repairing leaking bolted flange joints using the sealant injection nut.

Systems and methods for sealing bolted flange joints to stop or prevent leakage are disclosed. The system includes a sealant injection nut. The sealant injection nut generally comprises a threaded nut configured to be threaded onto a stud bolt of a flange joint. The nut is configured to inject sealant into the internal passages of the flange joint. The nut includes a passageway drilled through the sidewall. Fitted to the passageway is a high-pressure sealant-compatible injection fitting and an internal check-valve. Provided within the central cavity of the nut, at the flange-facing end, is a groove that facilitates the flow of sealant injected through the passageway into the passages of the bolted flange. A method is also provided for manufacturing the sealant injection nut. A method is also provided for repairing leaking bolted flange joints using the sealant injection nut.

Apparatuses and methods related to a high pressure fluid processing device having a dual check valve setup that can be quickly and easily maintained with replacement parts are disclosed herein. In a general example embodiment, a high pressure processing device includes a body including a first surface having a first recess, a second surface having a second recess, and a third surface having a third recess, a first subassembly at least partially inserted into the first recess of the body, the first subassembly including a first check valve, a second subassembly at least partially inserted into the second recess of the body, the second subassembly including a second check valve, and a third subassembly at least partially inserted into the third recess of the body, the third subassembly coupling the body to a fluid driving mechanism, wherein the first subassembly, second subassembly and third subassembly are configured to be independently attachable to and detachable from from the first recess, second recess and third recess, respectively.

Various implementations include a device for pumping grout. The device includes a body and a pump. The body defines a first opening, a second opening, and a third opening. Each of the first, second, and third openings is in fluid communication with each other. The first opening includes a first one-way valve configured to allow the flow of grout toward the second and third openings, and the second opening includes a second one-way valve configured to allow the flow of grout away from the first and third openings. The pump is sealingly coupled to the third opening and in fluid communication with the first and second openings. The pump is configured to increase and decrease pressure within the body to cause the flow of grout from the first opening to the second opening.

A valve assembly for a fuel tank system including a fuel tank having a fuel tank outlet and a purge canister includes a main valve and a safety check valve. The main valve can be configured to move from a closed position to an open position. The main valve can have a main valve first port fluidly coupled to the outlet of the fuel tank and a main valve second port fluidly connected to the purge canister. The safety check valve can be configured to move from an open position to a closed position upon a pressure drop at the fuel tank outlet exceeding a predetermined threshold. The safety check valve can have a safety check valve first port fluidly coupled to the outlet of the fuel tank and a safety check valve second port fluidly coupled to the purge canister.