Noun Valve-shell Definition and Examples


Noun:

Valve-shell

Pronunciation:

/valv/

Definition:
1.

noun

A device for controlling the passage of fluid or air through a pipe, duct, etc., especially an automatic device allowing movement in one direction only.
  1. 'One of the safety shutoff valves had closed in the coolant system of the third engine.'
  2. 'The pump design accomplishes all fluid control functions while eliminating valves that can clog, fatigue, and fail, causing accuracy drifting and pump failure over time.'
  3. 'On offer is a 3 litre petrol engine V6 with four valves per cylinder.'
  4. 'Close the water valves and disconnect the water lines just above the valves and the drain piping at the trap.'
  5. 'If the burner doesn't ignite quickly, shut off the valves, leave the lid open and allow the grill to air out for several minutes before you try to light it again.'
  6. 'The patented sensitive microphone detects the noise of a water leak transmitted along pipes, valves, and hydrants and through the ground.'
  7. 'To remove the clog, close the shutoff valve at the bottom of the radiator and unscrew the air vent.'
  8. 'The required ingredients are then pumped from their storage areas through a series of valves and pipes that eventually lead to the blend tanks.'
  9. 'Such valves allow the intake of air but not the outflow.'
  10. 'Using them would mean that attachments could be installed without disassembly of the main control valve or draining of hydraulic fluids.'
  11. 'You could even build a functional, if somewhat cumbersome, guitar amplifier with a hydraulic system replacing transistors or valves.'
  12. 'Unlike delicate solid-state circuitry, valves are incredibly robust from an electrical perspective.'
  13. 'Equipped with transistors instead of valves, it could be operated for 80 hours on four hearing aid batteries, costing 2s 6d each.'
  14. 'The soloists played on natural horns, instruments that have no valves and are not as powerful as their modern descendants.'
  15. 'the aortic valve'
  16. 'When crocodiles are completely submerged, the ears and nostrils are closed by valves, and the eyes covered by membranes.'
  17. 'Veins become varicose when valves in the veins closest to the skin's surface don't function correctly.'
Each of the halves of the hinged shell of a bivalve mollusc or brachiopod, or of the parts of the compound shell of a barnacle.
  1. 'Note that each shell valve is symmetrical about the midline, but the two shell valves are often unequal in size.'
  2. 'All these plates that attach to the floor of the brachial valve may have been thickened by secondary overgrowth.'
  3. 'Dehiscence of the anther valves begins at the distal end.'
  4. 'As the pollinator pushes back the brush-like hairs, the valve opens releasing the pollen onto the back of the pollinator.'
  5. 'The brush-like hairs at the end of the anther tube are not bent, and they enclose the valve.'
((n.) Any fresh-water gastropod of the genus Valvata.)


Origin:
Late Middle English (denoting a leaf of a folding or double door): from Latin valva.

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