Kgv

UNI-TECH: knife gate valves provide reliable and long life on variety of tough applications including corrosive and abrasive services. Key aspects like operating , service life. Through continuous process improvement our products are competitive enough to meet the global requirements. UNITECH KNIFE GATE VALVES are designed for isolation, on off and throttling application.

MSS SP-81 applies to bonnetless metal seated knife gate valves, 2" to 24" size, 150 psi CWP. Sizes above 24" are not covered under this standard. Additionally, resilient seated knife gate valves and slide knife gate valves are also not covered under MSS SP-81. These products are subject to the individual manufacturer's internal testing and design standard.
Body- MSS SP-81 requires the valve body (pressure vessel and related structure) to be designed for and hydrostatically pressure tested to 1.5 times the rated working pressure.

Valve rated pressure - 150 psi
Body test pressure - 225 psi

Gate - MSS SP-81 requires the gate to be designed for and hydrostatically pressure tested to 1.1 times the rated working pressure.

Valve rated pressure - 150 psi
Gate test pressure - 165 psi

Seat - MSS SP-81 has an allowable leakage rate (for metal to metal seated valves) of 40 cc per inch of diameter, per minute at 40 psi pressure. On a 12" valve this would be equal to 40 times 12, or 480 cc per minute at 40 psi.

Maximum allowable leakage of 0.6 GPM when tested with water at 40 psi applied in the normal flow direction.
No visible leakage when tested with water at 40 psi (for soft seated valves only).

Face to Face - MSS SP-81 has specified face-to-face dimensions and tolerances for each valve size to assure ease of installation for the consumer, regardless of the valve manufacturer.



Typical Applications


Medium & Heavy duty applications

Sizes available


50-500mm (2 to 20)

Pressure rating Cast iron body


CWP 10 bar, 50-300mm (2, 12) size; lower on higher sizes

Steel/St. Steel


CWP 10 bar, 50-600mm (2, 20) size; lower on higher sizes

Face-to face


Complies with MSS SP-81 (upto 900mm (36) size)

Drilling


To suit ANSI 150lb,AS 2129 Table D & E, DIN PN10 (others on some sizes)

Material availability


standard; others on request

Body


Steel, stainless steel (304, 316)

Gate


304, 316 st. steel

Packing


PTFE syntex fiber standard; others on request

Seat / Leakage


Metal-to-metal, As per MSS SP-81 (upto 500mm (20) size




Resilient seats, EPDM, Chloroprene, Viton, Zero leak




PTFE, Max leakage of 4cc/min/inch (upto 600mm (24) size

Superstructure


Steel, epoxy painted

Handwheel


Cast iron, epoxy painted

Motorized actuators


Is available