Pasco - Model BB & CS -Cast Steel Gate Valve
PASCO cast steel gate valve are designed and manufactured to provide maximum service life and dependability. All gate valves are full ported and meet the design requirements of American Petroleum Institute Standard API 600 & API 6D, British Standard BS 1414 & BS EN 1984 and generally conform to American Society of Mechanical Engineers standard ASME B16.34. Valves are available in a complete range of body/bonnet materials and trims.
Range of Materials
Standard body/bonnet materials include nine grades of carbon, low alloy and stainless steels. For special applications they can be supplied in other grades of alloy and stainless steel. There`s a full range of trim materials to match any service. Optional packing and gasket materials are available for a full range of service conditions.
Available Modifications for PASCO Cast Steel Valves
- Trim Changes
- End Connection Modifications
- Packing and Gasket Changes
- Operator Mounting
- Handwheel Extensions
- Pressure Equalizing
- By-pass
- Customer Specified Coatings
- Weld End Bore Changes
- Oxygen & Chlorine Cleaning & Packaging
Operating
Large hand wheels for easy operation. Also available with gearing, motor actuators, pneumatic or hydraulic actuators for more difficult services.
OS & Y
Outside Screw and Yoke. Cast steel gate valve yoke integral with bonnet for 150Lb-8”,300Lb-8H”, 600Lb-6".900Lb-4”& Small.
Lantern ring and double packing set
Lantern ring with leak-off fitting connection and double packing stack is optionally available for critical services.
Stern
All wedge gate valves are provided with upset forged T-head stems. By forging the T-head, the stem at the stem-wedge connection is stregthened. This design also allows the wedge to self-align, eliminating the possibility of a bent stem jamming the wedge.
Live Load Packing
In services requiring frequent cycling or with high pressure/ temperature variations, live loading extends the service life between maintenance periods by requiring less frequent packing gland adjustments. Belleville springs are employed to provide constant packing gland stress.
BB
Bolted bonnet. Welding bonnet and pressure seal bonnet in services requiring frequent cycling or with high pressure / temperature variations.
Yokesleeve
Extra long thread engagement between yoke sleeve and stem provide long thread life. Valves of sizes larger than 150Lb-12", 300Lb-10”, 600Lb-6”, 900Lb / 1500Lb / 2500Lb-4" are regularly provided with roll bearing yokes.
Body-to-Bonnet Joint
A flat face gasket joint is used in the 150Lb valves. A male and female joint is used in 300Lb to 600Lb valves. Ring joint is used in the body to bonnet connection in 900Lb & higher rated valves.
Wedge
Integral guide rib faces assure self-centering of wedge. Flexible wedge gate valve has a one-piece, twin-disc wedge, which is designed so that each half flexes independently. Available in solid, flex split and HIS designs.
