The invention, the pressure indicator is thread fitted onto the Radiator; the pressure indicator is designed to conduct 2 unique functions of sensing the pre decided max sustainable pressure and communicating the same. Once the pre-decided maximum sustainable pressure of the Radiator is reached, the spring gets actuated and allows air to flow inside the pressure indicator assembly. The air flow pushes the arrow head component; the top portion of the component penetrates through the rubber retainer center hole into the visible transparent zone of the assembly. The retainer rubber and the transparent tube only allow the partial passage of the arrow head component and entrap its base stem portion permanently, hence permanently flagging off the indicator. The flagged component is visible through the transparent tube, indicating that the pressure has been breached.

A gas flow indicator device (10) has an elongate housing (12) defining a chamber (20) enabling gas flow from an inlet (22) at a first end (16) to an outlet (24) at a second end (18). An indicator member (26) within the chamber (20) extends from adjacent the first end (16) over part of the length of the chamber (20) and is of annular form enabling gas to enter the chamber along a bore (28) through the indicator member (26). The indicator member (26) is spaced from an inner surface (30) of a peripheral sidewall (14) of the housing (12) to define an annular space (32) within the chamber (20). A concealment member (34) is movable from the first end (16) by a sufficient pressure generated by gas flow through the chamber (20), against a biasing member (36) acting to bias the concealment member (34) to the first end (16). An annular skirt (38) of the concealment member (34) is receivable into the annular space (32) so one end (40) of the skirt (38) provides a seal against an annular surface (42) at an end wall (44) at the first end (16), while a transverse wall (48) at the other end (46) of the concealment member (34) defines an opening (50) providing resistance to gas flow. The one end (40) of the skirt (38) can be held in sealing engagement at the annular surface (42) to conceal the indicator member (26) from view through an adjacent window (52) of the housing (12). Increasing gas flow rate to achieve the sufficient pressure overcomes the bias, enabling the concealment member (34) to move towards the second end (18), exposing the indicator member (26) to view through the window (52), and thereby providing a visual indication of gas flow.

A differential pressure gauge for measuring a difference in pressure present between a low pressure portion of a fluid and a high pressure portion of the fluid comprises a cylinder including an opening, a housing including an opening, and a piston extending from a first end having a visual indicator to a second end having a remote indicator. The first end of the piston is in fluid communication with the high pressure portion of the fluid and the second end of the piston is in fluid communication with the low pressure portion of the fluid. A sensor is configured to sense a presence of the remote indicator when the remote indicator is within a sensing range of the sensor. The sensor is coupled to a sensor positioning mechanism for adjusting a position of the sensor with respect to the axial direction of the housing.

Embodiments of a valve assembly and a plumbing system incorporating the same are provided herein. In some embodiments, a valve assembly for use with an enclosed environment includes a housing having an interior volume, an inlet disposed at a first end of the housing and fluidly coupled to an environment surrounding the housing, and an outlet disposed at a second end of the housing opposite the first end and fluidly coupled to the enclosed environment; a first valve having a first valve seat and a first sealing member at least partially extending through a first opening in the first valve seat in a closed position; and a second valve disposed beneath the first valve and having a second valve seat and a second sealing member at least partially extending through a second opening in the second valve seat in a closed position.

A Device for measuring a force applied by a fitting apparatus provided with a threaded rod having an external or internal thread, includes a hydraulic chamber containing a fluid; a piston configured to slide inside the hydraulic chamber; a threaded connector fixed to the piston, the threaded connector having a thread configured in such a way that the threaded rod screws onto the threaded connector, so that the threaded rod can impose an axial force on the piston resulting in travel of the piston in the hydraulic chamber; and a pressure gauge communicating with the hydraulic chamber, configured to measure a pressure inside the hydraulic chamber created by the axial force applied on the piston by the threaded rod.

An air compressor having a pen-type pressure gauge is disclosed and provided for measuring the pressure of the compressed air produced by air compressor as well as releasing air into an ambient environment when the pressure is greater than a predetermined maximum safety value, so as to achieve the operational safety without installing a separate safety valve and prevent an inflated object from damages.

An over-pressure indicator, including a cup-shaped body having, on its bottom, a hole inside which is sealably housed a mobile element loaded by a spring towards the bottom of the cup-shaped body, the mobile element facing an indicator sensitive part for communication with an area where pressure verification is wanted. The mobile element coupled with a signaller of a movement thereof. The spring pressed by a pre-loading ring nut screwed onto the cup-shaped body. The nut torsionally removably coupled with a calibration cap of the indicator. The calibration cap having at least one stop that, when it abuts against a portion of the cup-shaped body, limits further screwing of the nut thus determining pressure beyond which mobile element movement is allowed. The movement causing intervention of the indicator so by coupling the suitable calibration cap and indicator and screwing it in fully, setting the indicator intervention pressure is possible.

A compressor unit 1 comprises a compressor 5 and a pressure meter 6. The pressure meter 6 comprises: a tubular body 18 communicating with the surge chamber 12B, a meter-piston 19 movable in the tubular body 18 in the longitudinal direction thereof by the compressed air, and a spring 20 biasing the piston 18 toward the front end. The tubular body 18 comprises a small diameter portion 18F in which a seal ring 25 of the piston airtightly contacts with the tubular body, and a large diameter portion 18R in which a gap D is formed between the seal ring and the tubular body. The large diameter portion is connected to the small diameter portion via a step K at which the insider diameter of the tubular body 18 is abruptly changed, whereby when the compressed air reaches to a specified pressure and the seal ring of the piston is moved beyond the step K, the compressed air is discharged through the gap D.

A ball mount for measuring tongue weight of a trailer is disclosed. The ball mount can comprise a ball portion for interfacing with a ball configured to couple with a tongue of a trailer, a hitch portion for interfacing with a hitch receiver associated with a vehicle, and a load measurement device associated with the hitch portion. The hitch portion can be configured to pivot relative to the hitch receiver about a fulcrum in response to a downward force on the ball, with the hitch receiver resisting rotation of the hitch portion about the fulcrum thereby inducing a load on the hitch portion. The load measurement device can be configured to determine a magnitude of the downward force on the ball based on the load on the hitch portion.

A pressure gauge of which the presence or absence of a measurement error can be easily checked is provided. A pressure gauge includes: a piston; a first conversion mechanism converting a linear motion of the piston against an elastic force of a spring into a rotating motion about a first rotation shaft, the linear motion being caused by the pressure transmitted from a target to be measured; an index that is fixed to one end side of the first rotation shaft; a dial; momentum detecting means for detecting momentum indicating an amount of movement of the piston; and a pressure sensor measuring a pressure value or the pressure acting on the internal space of the cylinder. Determining means determines whether a difference between a first measurement value and a second measurement value exceeds a predetermined value, the first measurement, value being estimated from the momentum detected toy the momentum detecting means, the second measurement value being measured by the pressure sensor. Notifying means notifies a user if the difference between the first measurement value and the second measurement value exceeds the predetermined value.