A pressure sensor (1) is specified, comprising a housing (2), a membrane (3), which forms with the housing (2) a chamber (4) closed off toward the outside, and a filling opening (6) for filling the chamber (4) with a fluid medium (5). The filling opening (6) is closed by means of a soldering or welding closure (7, 8). Furthermore, a method for producing a pressure sensor (1) is specified, wherein a housing (2), which together with a membrane (3) forms a chamber (4), is provided, the chamber (4) is filled with a fluid medium (5) through a filling opening (6), and the filling opening (6) is subsequently closed by means of soldering or welding.

A test cap (100) for fluid pressure testing of pipework is described.

The test cap (100) comprises a body (30) releasably attachable to pipework, the body (30) having a chamber (la) capable of being in fluid communication with pipework when test cap (100) is attached to the pipework, and a pressure-sensitive indicator (4) for indicating the presence or absence of fluid in the chamber (la) or in the pipework, or a change of pressure in the chamber (la) or in the pipework, when the chamber (la) is in fluid communication with the pipework.

The invention provides an inflator with an upper cover showing a pressure value, comprising: a body with an air chamber, one end of the air chamber is an open end; an air outlet channel communicated with the air chamber; a push rod disposed in the air chamber; a driving unit provided with a driving part, the driving unit is communicated with the air outlet channel; an upper cover covered on the open end of the air chamber of the body; and a pressure display unit, the pressure display unit has a linkage part and a display part; the linkage part is linked with the driving part, and the display part is driven by the linkage part to produce a rotational position change with the push rod as an axis.