By HY Valves

Lug type high performance butterfly valves



♦ Size :  Nominal Diameter 1-1/2″ ~ 48″ (DN40~1200)

♦ Rating :  Class 150, PN6 PN10 PN16, JIS 5K 10K 16K (150LB-600LB)

♦ Suitable Temperature: -50°C ~200°C

♦ Connection: Wafer, Lug, Flange

♦ Constructions : concentric-pivoted ,double-eccentric,Triple Eccentric

♦ Material :   Body Material:        WCB, CF8, CF8M LCB WC6  WC9

valve Disc :304,316,304L,316L

valve Packing material:EPDM,NBR,VITON

♦ Seat :     PTFE seat and PTFE+metal Seat Sealing Constructions(RPTFE)

♦ valve operator:  worm gear-type,pneumatic Actuator,Electric Actuator and hydraulic actuator,ect

♦ Related standard :  API 609 , EN 593,   API 598 , EN 12266,

♦ Applicable Medium: fresh water, sea water, air,Petro-Chemical Industry, Shipbuilding, District Heating / Steam Service, almost of the chemicals and all kinds of corrosive medium.


BUTTERFLY VALVES has been designed and developed with following features which will be satisfied customers in various service.

The face to face dimensions are provided in accordance with ISO 5752,JISB2032,JISF7480,BS5155,DIN2501 and AP1609.

The seat rubber seat is designed to contact the disc all around simultaneously when the disc is closed position only to avoid movement of seat by disc and unnecessarily high torque.


A groove is provided in a way of mid part of body all around to fasten the seat in the body to avoid movement of rubber seat by unnecessary forces.

An o-ring shape seal is provided in way of shaft hole in the rubber seat to minimize operating torque and is changeable for saving cost.


The o-ring with retainer is provided for the shaft hole in the body as a secondary sealing with low torque.

Taper pin to be provided to fix disc to the shaft.


All valves provide the flow in bi-direction with bubble tight.

The ball shape of the seat shall minimize the scratch damages caused by foreign bodies in the fluid.



The parts are exchangeable each other for quick repair works and maintenance.

V-packing with gland bush keeps the sealing in way of valve stem perfectly without additional tightening activity after operating of the valve.

The retainer together with seat ring shall work independently from the face of the valve to avoid force from adjoined pipe flange.

Top flange is provided in accordance with international standard,ISO 5211 ,and easy modification work is available between manual and remote type without any special equipment.

The retainer together with spring assisted and pressure-energized seat ring shall be remained independently from the adjacent pipe as the retainer is separated from the flange face of the valve.

Semi-lug or flange type cargo valve is available in accordance with marine standard to allow the removal of the piping downstream of the valve under the condition of keeping the closed valve with tap holes and jack bolts to avoid spillage of liquid in the upstream pipe.

Metal seated valve is available with modified double offset version.