NACB, LLC
8311 Brier Creek Parkway
Suite 105, #257
Raleigh, NC 27617 - USA
919-806-3880 - Phone
919-806-8774 - Fax
sales@nacbvalves.com

Figure 6005

ASME Class 1700 - 2700 - 4500

Standard Material Schedule:

• ASME Class 1700:  71 - 11 - 31 - 91
• ASME Class 2700:  71 - 11 - 22 - 31 - 91
• ASME Class 4500:  71 - 11 - 22 - 31 - 91

The Bonnetless BONT Valves Type BLY are designed to meet the requirements of the main customers under the heaviest duties like Superheated Steam at very high temperature and pressure, Feed Water at high pressure, Vent and Drain at the typical conditions of Supercritical Cycles as well as Chemical Plants under high pressure, e.g. NH3 Synthesis and Petrochemical Installations.

BLY Valves perform the following operations: Stop, Piston-Check, Manual Flow Control, Stop-Check. All the valves, Piston-Check excepted, can be power actuated and can be furnished with a locking device in any position, including a padlock with key.

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ASME B16.11

ASME B16.25

ASME B16.34

ASTM Standard: MSS SP-25

DIN 3239

ASME Boiler and Pressure Vessel Code Sect. III

These valves are usually used when tight seal is needed after a blowoff operation. This utilization could be required by process necessity and/or economical reasons. In the past the two functions were mostly performed by two different valves, fitted in series and operated in accordance with a definite sequence. Our valve type PDR carries out both functions in sequence and namely: blowoff with valve suitable open and tight sealing with valve closed. It is a multistage valve splitting the pressure drop along the whole disk that is along the different stages of the disk. The design of the disk, of the fluid path inside the valve as well the materials are suitable to operation with high ∆p, therefore usually with critical flow. The pressure seal bonnet enables easy dismantling, inspection and maintenance. The stem is rising, non-rotating.

The following data must be indicated for the selection of a BONT valve, type PBR: fluid, max flow rate, upstream pressure P1, downstream pressure P2, temperature.

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ASME Class 1700 - 2700 - 4500

The continuous blowdown valves are needle valves designed for operation in open position. Their function is mainly to control a continuous flow of steam and/or water under high ∆p. For that reason the design and materials must be such as to minimize the effects of a fluid stream in condition of flashing or made of water containing sometime abrasive particles.

The outlet of our valves is purposely Venturi tube-shaped. The bonnetless design enables easy dismantling, inspection and maintenance. The stem is rising, non-rotating. A local stroke indicator shows the position of the disk.

The following data must be indicated for the selection of a  BONT valve, type BLB: fluid, max flow rate, upstream pressure P1, downstream pressure P2, temperature.