Abstract: The invention is directed to improvements in existing liquid hand held spray guns which deliver liquid to a spray nozzle and have fixed or adjustable spray pattern adjustment of the liquid being dispensed from the nozzle. The improvements comprise the addition of a ball valve between the spray gun internal air flow passage and a container of liquid to be sprayed through the nozzle and a venturi assembly which attaches upstream in a series relationship between the pressurized air input to the gun and the source of pressurized air. The venturi assembly is adaptable to substantially all of the liquid spray guns of the type described and when installed reduces the pressure of the pressurized air entering the gun to 10 PSI or less to comply with governmental environmental pollution standards.

Abstract: A marine riser coupling assembly comprised of a pair of flanged couplings (14, 16). A pin insert (36) is retained (44, 54) within tubular portions (22, 24) of the couplings. The insert has multiple outside diameters (50, 50), and seals (66, 74) on each.

Abstract: A pack-off seal assembly 26 particularly suitable for use for purposes of effecting a seal between a wellhead housing 18 and a casing hanger 16. The subject pack-off seal assembly 26 is designed to be interposed between the cylindrical wall surface 18a of the wellhead housing 18 and that of a casing hanger 16 so as to be movable between a non-sealing position and a sealing position relative thereto in response to an actuating force of low torque magnitude being applied thereto. The pack-off sealing assembly 26 includes an upper metal seal 30 having downwardly extending lips 44, a lower metal seal 32 having upwardly extending lips 46, and a plurality of independent non-bonded elastomeric members 36, 38 of differing diameters suitably supported between the upper and lower metal seals 30, 32.