back pressure valve इन हिंदी

back: कमर पीछे का

back pressure: पश्च दाब पश्च

pressure: दुख परेशानी

valve: द्वार वाल्व कपाट

	1.	Several different types of valves are in use. some are back pressure valves .
	2.	Application of shuttle back pressure valve in fluid transportat ion
	3.	Research on action of slow closure back pressure valve in water delivery system with air cushion surge tank

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