Ram Universal Limited
VAAS Products
VAAS Group commenced operations in 1980 as a trading house focusing on high quality industrial valves. Promoted by a valve technocrat, the philosophy of the group has always been to provide the user with the optimum solution to their valve needs rather than just sell valves. This has resulted in a loyal customer base for all the products VAAS is associated with. Another facet of the group has been their pioneering role in bringing the best international valve technology to the Indian customer.
We’re focused- The reason why we are the largest knife Gate Valve manufacturer in India with a market share of over 70%. The present customer base includes virtually every major user of knife gate valves in India, besides customers in many overseas markets.
We presently export to over 35 countries and they include Australia, Indonesia, Singapore, New Zealand, Pakistan, South Africa, Botswana, Canada, Namibia, Spain, Bangladesh, Peru, Philippines, Swaziland, Saudi Arabia, Ghana, Chile, Slovenia, Egypt, Thailand, Malaysia, Mexico, Kuwait, Russia, Dubai, Nepal, Israel, UK, USA and Vietnam.
Uni-Directionl Knife Gate Valves
Knife gate valve is one of the application-specific designs among industrial valves. These valves are designed to handle basically non-clean media with features that ensures minimum contact between moving parts of the valve. This is achieved by having a precision-ground gate that is held between layers of gland packing with almost no contact between the body parts and gate during most of its travel.
The seating itself is accomplished with an almost non-sliding motion aided by jams located in the body. Avoiding sliding contact between gate and body permits this valve to handle abrasive particles present in the media much better than conventional designs. Another feature is the beveled bottom edge of the gate (from which it derives the 'knife' in its name) which allows positive closure of the gate even when solid particles settled at the bottom of the body.
In handling abrasive media, deflection cones are generally used in order to avoid direct impingement of the media on the seat surface; hard facing of body or seating parts is also sometimes used. Purge connections which let in suitable fluids at pressures higher than line pressure are Welded-jams with relieved inlet area also sometimes provided in these valves to clean seating surfaces(body purges) and packing area (chest purges). This minimizes abrasive wear and tear during valve opening and closure.
Knife gate valves are excellent hopper isolation valves with their ability to cut through flowing powders and close by dislodging any material in the seating area. This is also perhaps the only valve design which can tolerate differential thermal expansion of its parts without affecting its functions, thus making an ideal choice for handling high temperature media.
- FIG930A - Wafer, semi-lug, uni-directional knife gate valve-rising stem handwheel (for MSS SP-81 markets)
- FIG930 Versa - Wafer, semi-lug, uni-directional knife gate valve; non-rising stem handwheel (Model for European Markets)
- FIG940 - Wafer, full lug, uni-directional knife gate valve; rising stem handwheel
- FIG950 - Wafer, two lug, uni-directional knife gate valve; rising stem handwheel
- FIG955 - Uni-directional knife gate valve;Hopper Isolation Knife Gate Valve;
- FIG960 - Wafer, square/rectangular, uni-directional knife gatevalve; rising stem handwheel
- FIG970 - Wafer, flanged, uni-directional knife gate valve; rising stem hand wheel; specially designed for Coal Mill Isolation
- FIG980/985 - The classic bonnetless design of knife gate valves is sufficient for most applications.
- FIG930A - Wafer, semi-lug, uni-directional knife gate valve-rising stem handwheel (for MSS SP-81 markets)
- FIG930 Versa - Wafer, semi-lug, uni-directional knife gate valve; non-rising stem handwheel (Model for European Markets)
- FIG940 - Wafer, full lug, uni-directional knife gate valve; rising stem handwheel
- FIG950 - Wafer, two lug, uni-directional knife gate valve; rising stem handwheel
- FIG960 - Wafer, square/rectangular, uni-directional knife gatevalve; rising stem handwheel
- FIG970 - Wafer, flanged, uni-directional knife gate valve; rising stem hand wheel; specially designed for Coal Mill Isolation
- FIG980/985 - The classic bonnetless design of knife gate valves is sufficient for most applications.
Bi-Directionl Knife Gate Valves
Knife gate valves are generally uni-directional valves; however, in some application situations, valves are required to handle pressure or flow from either directions. Bi-directional designs are used in such situations. VAAS offers a range of bi-directional gate valves for such requirements.
Unlike uni-directional knife gate valves, bi-directional valves are always resilient seated; VAAS offers a design that uses a U-shaped elastomer seal that provides a peripheral seal along the edge of the gate. There is no raised seat in the flow path and in the open position these valves offer maximum flow area and minimum resistance to flow (and lowest pressure drop).
- FIG710/711 - Wafer, bi-directional gate valve; non-rising stem handwheel
- FIG730 Versa - Wafer, semi-lug, bi-directional knife gate valve; non-rising stem handwheel (Model for European Markets)
- FIG740 - Bi-directional knife gate valve; full lug body design. Under development.
- FIG752/755 - Wafer, semi-lug, bi-directional knife gate valve; non-rising stem handwheel
- FIG770 - Bi-directional knife gate valve; soft seated ported gate valve
- FIG780 - Wafer, bi-directional O-port gate valve; rising stem handwheel
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