| Valves |
| Monday, 25 September 2006 |
Valves - to control the flow of liquid nitrogen to process.
These valves are designed to be incorporated into vacuum superinsulated pipework in applications where it is essential to reduce heat inleak to a minimum and so conventionally-insulated valves are unsuitable
Type 35-10 Vacuum Superinsulated Valves
Type 35-10 valves are of an angle pattern to minimise pressure drop. Type 35-12 are right-angled valves.
Construction is in austenitic stainless steel, with all-welded body/jacket, single-piece stem, and tapered fluoropolymer seat with metal-to-metal back-up.
For ease of maintenance, the handwheel/ shaft/gland/seal assembly may be withdrawn through the top of the valve without having to break the vacuum seal.
Types 35-10 and 35-12 are fitted with a handwheel, for manual operation.
Types 35-11 and 35-13 are designed for automatic operation with pneumatic actuators, types 35-50 to 35-80.
Type 36-10 Vacuum Superinsulated Valves
The type 36-10 is a new low-cost manual vacuum superinsulated cryogenic globe pattern valve, designed to be incorporated into vacuum superinsulated pipework in applications where it is essential to reduce heat inleak to a minimum and so conventionally-insulated valves are unsuitable.
Construction is in austenitic stainless steel, with all-welded body/jacket and single-piece stem.
The vacuum superinsulation provides a very high degree of insulation and minimises condensation, icing etc.
For ease of maintenance, the handwheel/ shaft/gland/seal assembly may be withdrawn through the top of the valve without having to break the vacuum seal.
The model 36-10 is for use in a horizontal line, with the handwheel vertical. (For applications in a vertical line, the model 35-10 should be used.)
The valve would normally be supplied as part of a section of vacuum superinsulated pipework, although individual valves can be supplied in an independent vacuum jacket, incorporating superinsulation, cryosorption materials and contraction compensators, and terminating in bayonet couplings or weldable "re-entrant" ends.
The 36-10, which is available in 18 mm, 30 mm and 45 mm sizes, has a maximum working pressure of 15 bar g
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