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Common gate valves are actuated by a threaded stem that connects the actuator (e.g. handwheel or motor) to the gate. They are characterised as having either a rising or a nonrising stem, depending on which end of the stem is threaded.
Valves are available in several types, based on design and purpose: Gate, plug, or ball valves – Isolation; Globe valve – Throttling; Needle valve – Throttling, usually with high precision but low flow; Butterfly or diaphragm valves – Isolation and throttling; Check valve – Preventing reverse flow (non-return)
A chase nipple has male threads on one end only. The other end is a hexagon. The chase nipple passes through the knockouts of two boxes, and is secured by an internally threaded ring called a lock nut. [1] [2] Chase-Shawmut Company, of Boston, is the company which first produced chase nipples. [3]
American National Standard Pipe Thread standards, often called national pipe thread standards for short, are United States national technical standards for screw threads used on threaded pipes and pipe fittings. They include both tapered and straight thread series for various purposes, including rigidity, pressure-tight sealing, or both. [1]
Taper threads, British Standard Pipe Taper thread (BSPT), whose diameter increases or decreases along the length of the thread; denoted by the letter R. BSPT threads [2] These can be combined into two types of joints: Jointing threads These are pipe threads where pressure-tightness is made through the mating of two threads together.
The inside of an extremely large butterfly valve Duplex ball valve Three check valves in corrosion-resistant Hastelloy Stainless steel gate valve. Valves can be categorized into the following types, based on their operating mechanism: Ball valve, for on–off control without pressure drop. Ideal for quick shut-off, since a 90° turn completely ...
No thread ABNT NBR 8614 b ABNT NBR 8614 NPT: 19.1 mm 1.814 mm 3/4" 14 TPI Bayonet Autogas Bayonet No thread Bayonet camping: N/A No thread EXT N/A Butane Canister, 225 g (8 oz) N/A No thread EXT N/A Camping gas VBC02 (G.3) EN 15202 ISO: 16.0 mm 1.5 mm 0.629" 16.93 TPI INT RH Camping gas VBC03 (G.33) EN 15202 BSP: 16.7 mm 1.337 mm 3/8" 19 TPI
Aerospace metric threads (MJ) – ISO 5855; Tyre valve threads (V) – ISO 4570; Metal bone screws (HA, HB) – ISO 5835; Panzergewinde (Pg) (German) is an old German 80° thread (DIN 40430) that remained in use until 2000 in some electrical installation accessories in Germany.
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