Applicable Standards
Manufacturing and Acceptance: ASME B16.34 -API600
Butt-welded end size: ANSI B16.25
Flange size: ANSI B16.5
End to End: ANSI B16.10
Valves test: API 598
Introduction Flange end size、End to End、manufacturing and acceptance can be supplied as customers' requirements.
※Size is not suitable for ANSI B16.10
Introduction
Thermal binding and pressure locking will not occur in Parallel Slide Gate Valve(PSGV) under high temperature work condition which can't lead to disc trapped. Therefore, PSGV is extensively used in high pressure and high temperature fields.
Pressure relief device is used to prevent the valve from destroy over pressurization.
To avoid the seat wear problems, the disc and seat are hard-faced to keep a different hardness with Stellite 6# and Stellite 12# respectively. Remarkable different hardness is kept to minimize a galling & its built-up effects on sliding metal surfaces. It results in long life cycle of the valve. The SPL centralized Inconel cone springs which distribute uniformly loading on both seats as well as compensating for irregular expansion of seats and seat wear. Also the precision guiding system in gate trim unit and stem connection eliminate vibration(due to flow turbulence) of gate trim unit even the disc position in partially open. SVTs' SPL parallel slide gate valves can be flow throttling in any form of flowing condition. Since open/close thrust of the PSGV is remarkably lower than other types of gate valves, no need to use hammer blow hand wheel or big sized hand wheel or impact type leverage. Also do not over torque the stem and watch carefully the stopper not bent when the stopper reaches the yoke pillars.
Shell Mat'ls: A105(WCB) F11(WC6) F22(WC9) F91(C12A),etc.
Properties and Features
Lower pressure drop
Improved seat ring assisted by line pressure and Not torque at seating position
While wedge type gate valves are susceptible to thermal binding or over pressurization, parallel slide gate valves are not
Low cost maintenance, Easy disassembly for repair and interchangeable parts
Self cleaning action between disc and seat
