Soft seated butterfly valves GEFA valve Vietnam distributor

Soft seated butterfly valves GEFA valve Vietnam distributor

Soft-seated LGP Vietnam

butterfly valve KG9 Web: www.lamgiaphu.com

2-piece, wafer type Đại lý Van GEFA Germany tại Việt Nam

with GEFA-MULTITOP GEFA valve Vietnam distributor

Automation system LGP Vietnam

•Soft-seated butterfly valve Web: www.lamgiaphu.com

•Centric design, for installation between flanges Đại lý Van GEFA Germany tại Việt Nam

•DIN EN 1092-1, PN 10/16, ANSI 150 lbs GEFA valve Vietnam distributor

•Two-piece body, self-centering, one-piece disc/stem LGP Vietnam

•DN 50 – DN 300 Web: www.lamgiaphu.com

Soft-seated Đại lý Van GEFA Germany tại Việt Nam

butterfly valve KG7 GEFA valve Vietnam distributor

2-piece, lug type LGP Vietnam

with GEFA-MULTITOP Web: www.lamgiaphu.com

Automation system Đại lý Van GEFA Germany tại Việt Nam

•Soft-seated butterfly valve GEFA valve Vietnam distributor

•Centric design, for installation between flanges  LGP Vietnam

•DIN EN 1092-1, PN 10/16, ANSI 150 lbs Web: www.lamgiaphu.com

•Two-piece body with lugs, one-piece disc/stem Đại lý Van GEFA Germany tại Việt Nam

•DN 50 – DN 300 GEFA valve Vietnam distributor

•Suitable for dead-end service up to 10 bar, depending on the working temperature. LGP Vietnam

Soft-seated Web: www.lamgiaphu.com

butterfly valve KG2 Đại lý Van GEFA Germany tại Việt Nam

1-piece, wafer type GEFA valve Vietnam distributor

with GEFA-MULTITOP LGP Vietnam

Automation system Web: www.lamgiaphu.com

•soft-seated butterfly valve, centric design, for installation between flanges DIN Đại lý Van GEFA Germany tại Việt Nam

•EN 1092-1, PN 10/16, ANSI 150 lbs GEFA valve Vietnam distributor

•One-piece body, self-centering, seat exchangeable LGP Vietnam

•DN 50 – DN 300 Web: www.lamgiaphu.com

Soft-seated Đại lý Van GEFA Germany tại Việt Nam

butterfly valve K19 GEFA valve Vietnam distributor

2-piece, wafer type LGP Vietnam

•Soft-seated butterfly valve Web: www.lamgiaphu.com

•Centric design, for installation between flanges  Đại lý Van GEFA Germany tại Việt Nam

•DIN 2501, PN 10/16, ANSI 150 lbs GEFA valve Vietnam distributor

•Two-piece body, self-centering, one-piece disc/stem LGP Vietnam

•DN 350 – DN 500  Web: www.lamgiaphu.com

Soft-seated Đại lý Van GEFA Germany tại Việt Nam

butterfly valve K17 GEFA valve Vietnam distributor

2-piece, lug type LGP Vietnam

•soft-seated butterfly Typvalve Web: www.lamgiaphu.com

•centric design, for installation between flanges  Đại lý Van GEFA Germany tại Việt Nam

•DIN EN 1092-1, PN 10/16, ANSI 150 lbs. GEFA valve Vietnam distributor

•Two-piece body with lugs One-piece disc/stem LGP Vietnam

•DN 350 – DN 500 Web: www.lamgiaphu.com

•Suitable for dead-end service up to 10 bar, depending on the working temperature Đại lý Van GEFA Germany tại Việt Nam

Soft-seated GEFA valve Vietnam distributor

butterfly valve KG4 LGP Vietnam

1-piece, lug type Web: www.lamgiaphu.com

with GEFA-MULTITOP Đại lý Van GEFA Germany tại Việt Nam

Automation system GEFA valve Vietnam distributor

•Soft-seated butterfly valve LGP Vietnam

•Centric design, for installation between flanges  Web: www.lamgiaphu.com

•DIN EN 1092-1, PN 10/16, ANSI 150 lbs Đại lý Van GEFA Germany tại Việt Nam

•One-piece body with threaded lugs, suitable for dead-end service GEFA valve Vietnam distributor

•Exchangeable seat LGP Vietnam

•DN 50 – DN 300 Web: www.lamgiaphu.com

Soft-seated Đại lý Van GEFA Germany tại Việt Nam

butterfly valve K11 GEFA valve Vietnam distributor

2-piece, wafer type LGP Vietnam

•Wafer type soft-seated butterfly valve, centric design, for installation between flanges  Web: www.lamgiaphu.com

•EN 1092-1, PN 10/16, ANSI 150, BS, JiS Đại lý Van GEFA Germany tại Việt Nam

•Two-piece body made of stainless steel, self-centering, one-piece disc/stem GEFA valve Vietnam distributor

•DN 25- DN 150 LGP Vietnam

Soft-seated Web: www.lamgiaphu.com

butterfly valve K07 Đại lý Van GEFA Germany tại Việt Nam

1-piece, lug type GEFA valve Vietnam distributor

Lug type soft-seated butterfly valve, centric design,  LGP Vietnam

for installation between flanges DIN EN 1092-1, PN 6/10/16, ANSI 150 lbs. Web: www.lamgiaphu.com

One-piece body; Exchangeable seat ring with additional steel support ring as a firm rubber-metal bonding. Đại lý Van GEFA Germany tại Việt Nam

DN 600 – DN 1200 GEFA valve Vietnam distributor

Soft-seated LGP Vietnam

butterfly valve K08 Web: www.lamgiaphu.com

1-piece, wafer type Đại lý Van GEFA Germany tại Việt Nam

•Wafer type soft-seated butterfly valve GEFA valve Vietnam distributor

•Centric design,  LGP Vietnam

•For installation between flanges  Web: www.lamgiaphu.com

•DIN EN 1092-1, PN 6/10/16, ANSI 150 lbs.  Đại lý Van GEFA Germany tại Việt Nam

•One-piece bod  GEFA valve Vietnam distributor

•Exchangeable seat ring with additional steel support ring as a firm rubber-metal bonding LGP Vietnam

PTFE-lined Butterfly Valves Web: www.lamgiaphu.com

PTFE-lined Đại lý Van GEFA Germany tại Việt Nam

butterfly valve type KG6 GEFA valve Vietnam distributor

with GEFA-MULTITOP LGP Vietnam

Automation system Web: www.lamgiaphu.com

PTFE-lined wafer type butterfly valve, centric design Đại lý Van GEFA Germany tại Việt Nam

for installation between flanges DIN EN 1092-1, PN 10/16, ANSI 150 lbs GEFA valve Vietnam distributor

Two-piece body, self-centering, one-piece disc/stem. LGP Vietnam

DN 50 – DN 300  Web: www.lamgiaphu.com

GEFA-MULTITOP  Đại lý Van GEFA Germany tại Việt Nam

Automation system GEFA valve Vietnam distributor

Exchangeable flange for direct mounting of actuators LGP Vietnam

PTFE-lined Web: www.lamgiaphu.com

butterfly valve type KG8 Đại lý Van GEFA Germany tại Việt Nam

with GEFA-MULTITOP GEFA valve Vietnam distributor

Automation system LGP Vietnam

PTFE-lined lug type butterfly valve, centric design, for installation between Web: www.lamgiaphu.com

flanges DIN EN 1092-1, PN 10/16, ANSI 150 lbs. Đại lý Van GEFA Germany tại Việt Nam

Two-piece body, self-centering, one-piece disc/stem, tight up to 10 bar. GEFA valve Vietnam distributor

DN 50 – DN 300  LGP Vietnam

GEFA-MULTITOP Web: www.lamgiaphu.com

Automation system Đại lý Van GEFA Germany tại Việt Nam

Exchangeable flange for direct mounting of actuators GEFA valve Vietnam distributor

PTFE-lined LGP Vietnam

butterfly valve type K16 Web: www.lamgiaphu.com

PTFE-lined wafer type butterfly valve, centric design, for installation Đại lý Van GEFA Germany tại Việt Nam

between flanges DIN EN 1092-1, PN 10/16, ANSI 150 lbs. GEFA valve Vietnam distributor

Two-piece body, self-centering, one-piece disc/stem. LGP Vietnam

DN 350 – DN 600 Web: www.lamgiaphu.com

PTFE-lined Đại lý Van GEFA Germany tại Việt Nam

butterfly valve type K18 GEFA valve Vietnam distributor

PTFE-lined lug type butterfly valve, centric design, for installation LGP Vietnam

between flanges DIN EN 1092-1, PN 10/16, ANSI 150 lbs. Web: www.lamgiaphu.com

Two-piece body, self-centering, one-piece disc/stem. Đại lý Van GEFA Germany tại Việt Nam

DN 350 – DN 600 GEFA valve Vietnam distributor

Double Eccentric Valves LGP Vietnam

High performance  Web: www.lamgiaphu.com

butterfly valve type HG1 Đại lý Van GEFA Germany tại Việt Nam

with GEFA-MULTITOP GEFA valve Vietnam distributor

Automation system LGP Vietnam

Double eccentric high performance butterfly valve for installation Web: www.lamgiaphu.com

between flanges DIN EN 1092-1, PN 10 – PN 40, ANSI 150/300. Đại lý Van GEFA Germany tại Việt Nam

DN 50 – DN 600 GEFA valve Vietnam distributor

GEFA-MULTITOP  LGP Vietnam

Automation system Web: www.lamgiaphu.com

Exchangeable flange for direct mounting of actuators Đại lý Van GEFA Germany tại Việt Nam

High performance  GEFA valve Vietnam distributor

butterfly valve type HG7 LGP Vietnam

with GEFA-MULTITOP Web: www.lamgiaphu.com

Automation system Đại lý Van GEFA Germany tại Việt Nam

Double eccentric high performance lug type butterfly valve GEFA valve Vietnam distributor

(valve can be used in dead-end service in recommended pressure direction). LGP Vietnam

Installation between flanges DIN EN 1092-1, PN 10 – PN 40, Web: www.lamgiaphu.com

ANSI 150/300 Đại lý Van GEFA Germany tại Việt Nam

DN 50 – DN 600 GEFA valve Vietnam distributor

GEFA-MULTITOP  LGP Vietnam

Automation system Web: www.lamgiaphu.com

Exchangeable flange for direct mounting of actuators Đại lý Van GEFA Germany tại Việt Nam

High performance  GEFA valve Vietnam distributor

butterfly valve type LGP Vietnam

HG7-..BK Web: www.lamgiaphu.com

with GEFA-MULTITOP Đại lý Van GEFA Germany tại Việt Nam

Automation system GEFA valve Vietnam distributor

Double eccentric high performance lug type butterfly valve LGP Vietnam

The insert ring is screwed on pressure-resistant. Web: www.lamgiaphu.com

Butterfly valve can be flanged on both sides. Đại lý Van GEFA Germany tại Việt Nam

The max. operating pressure is to be observed. GEFA valve Vietnam distributor

Installation between flanges DIN EN 1092-1, PN 10 – PN 40, ANSI 150/300  LGP Vietnam

GEFA-MULTITOP  Web: www.lamgiaphu.com

Automation system Đại lý Van GEFA Germany tại Việt Nam

Exchangeable flange for direct mounting of actuators GEFA valve Vietnam distributor

Triple eccentric valvesThrottle Valves LGP Vietnam

Triple offset high  Web: www.lamgiaphu.com

performance butterfly  Đại lý Van GEFA Germany tại Việt Nam

valve type HGT1, wafer type GEFA valve Vietnam distributor

with GEFA-MULTITOP LGP Vietnam

Automation system Web: www.lamgiaphu.com Full bi-directional Zero-leakage shut-off Đại lý Van GEFA Germany tại Việt Nam Temperature range: –50 °C to +450 °C GEFA valve Vietnam distributor Metal-Metal, frictionless non-interference disc operation LGP Vietnam Laminated seat/seal system integrated into valve body Web: www.lamgiaphu.com Secured stem sealing (option: TA-Luft) Đại lý Van GEFA Germany tại Việt Nam Triple offset high GEFA valve Vietnam distributor performance butterfly  LGP Vietnam valve type HGT7, Web: www.lamgiaphu.com Lug type Đại lý Van GEFA Germany tại Việt Nam with GEFA-MULTITOP GEFA valve Vietnam distributor Automation system LGP Vietnam Full bi-directional Zero-leakage shut-off Web: www.lamgiaphu.com Temperature range: –50 °C to +450 °C Đại lý Van GEFA Germany tại Việt Nam Metal-Metal, frictionless non-interference disc operation GEFA valve Vietnam distributor Laminated seat/seal system integrated into valve body LGP Vietnam Secured stem sealing (option: TA-Luft) Web: www.lamgiaphu.com Throttle valve for installation between flanges DIN EN 1092-1, Đại lý Van GEFA Germany tại Việt Nam PN10 (DN80-DN150:PN10/16) GEFA valve Vietnam distributor One-piece body with centering lugs, end-to-end stem, LGP Vietnam flat disc design with excellent flow characteristics Web: www.lamgiaphu.com Face-to-face dimension: DIN EN 558-1, line 20 Đại lý Van GEFA Germany tại Việt Nam (DIN3202-K1) GEFA valve Vietnam distributor Connection: DIN 3337 – ISO 5211 LGP Vietnam Flanged Ball Valves Web: www.lamgiaphu.com Flanged ball valve Đại lý Van GEFA Germany tại Việt Nam type FG GEFA valve Vietnam distributor Two-piece stainless steel flanged ball valve LGP Vietnam DN 15 – DN 100 : PN 10/40 Web: www.lamgiaphu.com DIN 3202 F4 / F5 Đại lý Van GEFA Germany tại Việt Nam EN 558-1 line 27/15 GEFA valve Vietnam distributor DIN 3202 F1  LGP Vietnam EN 558-1 line 28 Web: www.lamgiaphu.com Flanged ball valve Đại lý Van GEFA Germany tại Việt Nam type FGT GEFA valve Vietnam distributor PFA-lined flanged ball valve made of stainless steel LGP Vietnam Two-piece body. Web: www.lamgiaphu.com DN 15 – DN 50 : PN10/40 Đại lý Van GEFA Germany tại Việt Nam Face-to-face dimension EN 558-1, line 28 (DIN 3202 F1) GEFA valve Vietnam distributor 3-piece Ball Valve LGP Vietnam 3-piece ball valve DG1 Web: www.lamgiaphu.com with screwed ends Đại lý Van GEFA Germany tại Việt Nam Three-piece ball valve with screwed ends GEFA valve Vietnam distributor DN 8 – DN 80 : Full bore LGP Vietnam DN 15 – DN 150 : Reduced bore  Web: www.lamgiaphu.com  3-piece ball valve DG1 Đại lý Van GEFA Germany tại Việt Nam with butt weld ends GEFA valve Vietnam distributor •Three-piece ball valve with butt weld ends LGP Vietnam •DN 8 – DN 100 : Full bore Web: www.lamgiaphu.com •DN 15 – DN 150 : Reduced bore  Đại lý Van GEFA Germany tại Việt Nam 3-piece ball valve DG1 GEFA valve Vietnam distributor with orbital ends LGP Vietnam For use in systems with ultra-clean media  Web: www.lamgiaphu.com Option: Surface quality of the inner passage Ra 0.8/1.0 Đại lý Van GEFA Germany tại Việt Nam DN 8 – DN 100 : Full bore GEFA valve Vietnam distributor 3-piece ball valve DG1 LGP Vietnam with long butt weld ends Web: www.lamgiaphu.com Three-piece ball valve with long butt weld ends Đại lý Van GEFA Germany tại Việt Nam for assembly in the pipeline without dismantling the ball valve GEFA valve Vietnam distributor DN 8 – DN 50 : Full bore LGP Vietnam 3-way ball valve DG3 Web: www.lamgiaphu.com with butt weld ends Đại lý Van GEFA Germany tại Việt Nam Three-way ball valve with screwed/butt weld ends GEFA valve Vietnam distributor as switchover valve with L-bore LGP Vietnam DN 8 – DN 50 : Full bore Web: www.lamgiaphu.com 2-Piece Ball Valves Đại lý Van GEFA Germany tại Việt Nam 2-piece ball valve EN GEFA valve Vietnam distributor made of stainless steel LGP Vietnam Two-piece stainless steel ball valve with screwed ends Web: www.lamgiaphu.com Full bore Đại lý Van GEFA Germany tại Việt Nam DN 8 – DN 80 : PN63 GEFA valve Vietnam distributor 1-Piece Ball Valves LGP Vietnam 1-piece ball valve ED Web: www.lamgiaphu.com made of brass Đại lý Van GEFA Germany tại Việt Nam One-piece brass ball valve with screwed ends (female thread) GEFA valve Vietnam distributor and DVGW approval LGP Vietnam Full bore Web: www.lamgiaphu.com DN 8 – DN 50 : PN 40 Đại lý Van GEFA Germany tại Việt Nam Knife Gate Valves GEFA valve Vietnam distributor DOMINO-Knife gate valve LGP Vietnam type AT100 Web: www.lamgiaphu.com Knife gate valve for installation between flanges acc. Đại lý Van GEFA Germany tại Việt Nam EN 1092-1, with self cleaning plate guidance and flash-out-corners, GEFA valve Vietnam distributor self adjusting COMPACT-Cross-seal towards the atmosphere, LGP Vietnam hermetically sealed in both flow-directions, two-piece body, Web: www.lamgiaphu.com metallic and jitter-free guided knife plate, Đại lý Van GEFA Germany tại Việt Nam cutting edge on the lower body surface. GEFA valve Vietnam distributor DN 50-DN 200 LGP Vietnam DOMINO-Knife gate valve Web: www.lamgiaphu.com type AT150 Đại lý Van GEFA Germany tại Việt Nam Knife gate valve for installation between flanges as per DIN EN 1092-1 GEFA valve Vietnam distributor with self cleaning plate guidance and rinse edges LGP Vietnam self adjusting COMPACT-Cross-seal towards the atmosphere Web: www.lamgiaphu.com hermetically sealed in both flow-directions, two-piece body, Đại lý Van GEFA Germany tại Việt Nam metallic and jitter-free guided knife plate, GEFA valve Vietnam distributor cutting edge on the lower body surface. LGP Vietnam DN 50 – DN 300 Web: www.lamgiaphu.com DOMINO-Knife gate valve Đại lý Van GEFA Germany tại Việt Nam type AT200F GEFA valve Vietnam distributor Knife gate valve for instalation between flanges as per DIN EN 1092-1 LGP Vietnam and useable as end-valve, self adjusting COMPACT-Cross-seal Web: www.lamgiaphu.com towards the atmosphere, scraper to clean the knife gate positioned Đại lý Van GEFA Germany tại Việt Nam in front of it, hermetically sealed in both flow-directions, GEFA valve Vietnam distributor two-piece body, metallic and jitter-free guided knife plate with LGP Vietnam segment-formed radius, sharpened cutting edge Web: www.lamgiaphu.com on the lower body surface. Đại lý Van GEFA Germany tại Việt Nam ATEX certified Ex II 1D  GEFA valve Vietnam distributor DN 200-DN 1000  LGP Vietnam DOMINO-Knife gate valve Web: www.lamgiaphu.com type AT400 Đại lý Van GEFA Germany tại Việt Nam Knife gate valve with full and free passage, pigging also possible with GEFA valve Vietnam distributor calibre-tool, for installation between flanges acc. to DIN EN 1092-1 LGP Vietnam and useable as end valve, with self adjusting Web: www.lamgiaphu.com COMPACT-Cross-seal towards the atmosphere, hermetically Đại lý Van GEFA Germany tại Việt Nam sealed in both flow-directions, two-piece body, metallic and GEFA valve Vietnam distributor jitter-free guided knife plate, cutting edge on the lower body surface. LGP Vietnam DN 50-DN 1200 Web: www.lamgiaphu.com DOMINO-Knife gate valve Đại lý Van GEFA Germany tại Việt Nam type AT200 GEFA valve Vietnam distributor Knife gate valve for instalation betweeen flanges acc. LGP Vietnam DIN EN 1092-1 and useable as end-valve,with self cleaning plate Web: www.lamgiaphu.com guidance and flash-out-corners, self adjusting Đại lý Van GEFA Germany tại Việt Nam COMPACT-Cross-seal towards the atmosphere, hermetically sealed GEFA valve Vietnam distributor in both flow-directions, two-piece body, metallic and jitter-free LGP Vietnam guided knife plate with segment-formed radius, Web: www.lamgiaphu.com cutting edge on the lower body surface. Đại lý Van GEFA Germany tại Việt Nam DN 50-DN 1200 GEFA valve Vietnam distributor DOMINO-Control gate valve LGP Vietnam type AT200R Web: www.lamgiaphu.com Knife gate valve with special regulating disc to achieve a linear Đại lý Van GEFA Germany tại Việt Nam control characteristic, for installation between flanges as per GEFA valve Vietnam distributor DIN EN 1092-1 and useable as end-valve, with self adjusting LGP Vietnam COMPACT-Cross-seal towards the atmosphere, hermetically Web: www.lamgiaphu.com sealed in both flow-directions, two-piece body, metallic and Đại lý Van GEFA Germany tại Việt Nam jitter-free guided knife plate with segment-formed radius, GEFA valve Vietnam distributor cutting edge on the lower body surface.  LGP Vietnam DN 50-DN 1200 Web: www.lamgiaphu.com Non Return Valves Đại lý Van GEFA Germany tại Việt Nam Non return valve GEFA valve Vietnam distributor Non return valve LGP Vietnam type RF6666 Web: www.lamgiaphu.com Wafer type valve in short face-to-face dimension acc. Đại lý Van GEFA Germany tại Việt Nam DIN EN 558 / Series 49 GEFA valve Vietnam distributor Prevents backflow in the pipeline LGP Vietnam DN 15 – DN 150: PN 10 – PN 40  Web: www.lamgiaphu.com Non return valve Đại lý Van GEFA Germany tại Việt Nam type RF8686 GEFA valve Vietnam distributor  Wafer type valve in short face-to-face dimension acc. LGP Vietnam DIN EN 558 / Series 49  Web: www.lamgiaphu.com Prevents backflow in the pipeline Đại lý Van GEFA Germany tại Việt Nam DN 15 – DN 150: PN 10/16 GEFA valve Vietnam distributor Check valve LGP Vietnam Check valve Web: www.lamgiaphu.com Typ C Đại lý Van GEFA Germany tại Việt Nam Wafer type valve in short face-to face dimension  GEFA valve Vietnam distributor DN 32 – DN 500: PN 10/16 LGP Vietnam Check valve Web: www.lamgiaphu.com Typ C8686 Đại lý Van GEFA Germany tại Việt Nam Wafer type valve in short face-to face dimension DN 50 – DN 500: PN 10 GEFA valve Vietnam distributor Check valve LGP Vietnam Typ C8888 Web: www.lamgiaphu.com Wafer type valve in short face-to face dimension Đại lý Van GEFA Germany tại Việt Nam DN 50 – DN 500: PN 10 GEFA valve Vietnam distributor Actuators LGP Vietnam Pneumatic actuator Web: www.lamgiaphu.com Pneumatic rotary  Đại lý Van GEFA Germany tại Việt Nam actuator Series AP GEFA valve Vietnam distributor Electric actuator LGP Vietnam Positioning actuator OA Web: www.lamgiaphu.com Standard actuator:  Đại lý Van GEFA Germany tại Việt Nam 90°-actuator for on/off duty and positioning of ball valves and butterfly valves  GEFA valve Vietnam distributor Protection class: IP 67  LGP Vietnam Modes:  Web: www.lamgiaphu.com S4 -  30% – on/off duty Đại lý Van GEFA Germany tại Việt Nam S4 -  50% – Positioning class III  GEFA valve Vietnam distributor S4 – 100% – Positioning class II (on request) LGP Vietnam Adjustable SPDT travel switches (change-over contact) for each end positions Web: www.lamgiaphu.com Mechanical position indication Đại lý Van GEFA Germany tại Việt Nam Handwheel for “EMERGENCY” operation  GEFA valve Vietnam distributor Positioning actuator AS LGP Vietnam Standard actuator:  Web: www.lamgiaphu.com 90°-actuator for on/off duty and positioning of ball valves and butterfly valves  Đại lý Van GEFA Germany tại Việt Nam Protection class: IP 67  GEFA valve Vietnam distributor Modes:  LGP Vietnam S4 -  30% – on/off duty Web: www.lamgiaphu.com S4 -  50% – Positioning class III  Đại lý Van GEFA Germany tại Việt Nam S4 – 100% – Positioning class II (on request) GEFA valve Vietnam distributor 2 adjustable SPDT travel limit switches (1 for each end position) LGP Vietnam 2 adjustable SPDT torque limit switches (1 for each direction of rotation) Web: www.lamgiaphu.com Mechanical position indication Đại lý Van GEFA Germany tại Việt Nam Handwheel for “EMERGENCY” operation  GEFA valve Vietnam distributor