The gate valves
provided by Weldon mainly include bolted bonnet wedge gate valves and pressure seal bonnet gate valves, which are widely used in gas, petrochemical, oil, offshore, power station and refining industries. The opening and closing of the gate valve
depend on the movement of the disk perpendicular to the direction of the fluid, which is usually used to cut off the medium and cannot be used to regulate the flow.
is usually divided into rising stem gate valves and nor-rising stem gate valves. The rising stem gate valves is widely used due to easy lubricate and observe, the nor-rising stem gate valves remains at the same height during the opening and closing process, it is suitable for installation where the space is limited.
Gate Valve Design Features:
Disc: flexible wedge by default, solid wedge can be provided upon request.
Seat: Renewable seat and non-renewable seat are both available.
Body - Bonnet Connection: Bolted bonnet (BB) is normally applied on CL150 - CL1500, body bonnet seal is defaulted by gasket and RTJ ring. Pressure seal bonnet is applied on CL1500 - CL2500 with pressure seal ring for connection between body and bonnet.
Packing: graphite packing by default, PTFE packing on corrosive media. API 622 fugitive emission packing can be available upon request.
Back seat: Renewable back seat is applied on carbon steel and low alloy steel valve, integral back seat is applied for stainless steel valve.
Actuation: Hand wheel and gear box are normally designed for cast gate valve based on different size and pressure rating; Electric, pneumatic or Chain wheel operation can be provided upon request.
Size: 2" - 60" (DN50 - DN1500)
Pressure Rating: Class 150 LB - 2500 LB (PN16 - PN420).
Material: Carbon steel, Stainless steel, Alloy steel, including WCB、GS-C25、LCB、LCC、LC1、LC3、CF8、CF8M、CF3、CF3M、WC6、C5、C9、C12、4A、5A、MONEL、ALLOY20、C95800.
Connection End: BW, RTJ, Flanged.
Operation: Handwheel, Gearbox, Electric, Pneumatic.
Design & Manufacture Standard: API 600, ASME B16.34, DIN 3352, EN 1984, Bolted bonnet, pressure bonnet, bellow seal bonnet, high / low temperature extended bonnet and ISO 15848 fugitive emission designed valves are available upon different request of services.
Test Standard: API 598, EN 12266.
The ANSI gate valves
provided by Weldon in this section mainly follow the normative dimensions and pressure classes from American Petroleum Institute
) and American National Standards Institute
), including API 600
, API 6D
, ASME B16.34
, ASME B 16.5
, ASME B16.10
API 600 gate valve
from Weldon covers bolted bonnet steel gate valves
for the petroleum and natural gas industries, is the primary purchase specification of steel gate valve
. ANSI Gate valves
design and construction criteria are detailed, as well as materials and trim designations.
API 6D valves
from Weldon cover ball valves, check valves, gate valves for pressure ratings up to Class 2500, is the primary standard for valves used in pipeline service, Occasionally refinery and petrochemical purchasers will reference the more stringent testing requirements of API 6D.
Weldon DIN gate valves
are applicable to the cutting and connection of pipelines medium that are used in various industries such as petroleum, chemical industry, pharmacy, electric power station, etc. Pressure of PN1.6-16 Mpa and working temperature range -100 ℃ - 600 ℃. The DIN gate valves
are typical wedge gate valves
designed and manufactured to German DIN 3352 standards
covering materials of cast iron, carbon steel, stainless steel, Alloy steel, etc. OS & York, Rising stem gate valves
and nor-rising stem gate valves
are both available.
Logical structure, reliable seal, excellent performance and design.
Seal surface built up with welding hard alloy.
Stem surface tread by nitriding treatment.
More reliable double seal capability.
The Pressure seal bonnet (PSB) gate valves
provided by Weldon are adopted for high pressure service. Compared to Bolted Bonnet (BB) valve
, which the body flange and bonnet flange are joined by studs and nuts, when the system pressure increases, the potential for leakage through the body/Bonnet joint also increases, the unique structure of the pressure seal Bonnet gate valves
is that the body-Bonnet joints seals improves as the internal pressure in the gate valve increases, the higher the internal pressure, the greater the sealing force.
Weldon pressure seal gate valves
are available in size ranges from 2 inches to 24 inches, and pressure classes from Class 600 to Class 2500 LB.