Blowdown Valves

Overview

Efficient Blowdown Solutions: Precision Engineered Blowdown Valves for Optimal Boiler Performance

Flanged BDV

Impurities in the feed water can severely affect the performance and safety of industrial boilers. Dissolved minerals and suspended solids can accumulate, forming scale and sludge that hamper efficiency and endanger the life of the boiler itself.

The blowdown valves provide a simple yet elegant solution. These specialised valves periodically discharge a controlled amount of water and sediment from the boiler, thereby helping to regulate the levels of suspended solids and total dissolved solids (TDS). Boiler blowdown is a severe service application that standard valves are not equipped to handle.

They are also used in refineries at various units like Crude Distillation Unit (CDU), Fluid Catalytic Cracking Unit (FCCU), Hydrocracking Unit, Reforming Unit, Sulphur Recovery Unit (SRU), etc. to remove impurities and contaminants.

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Applications

Continuous Blowdown Valve (CBD):

CBD valves are mounted near the water surface level of the boiler drum. They are designed to operate in a steady open position, maintaining a consistent level of Total Dissolved Solids (TDS) in the boiler water. Thus, they prevent the carryover of high-TDS water into steam lines and protect downstream equipment.

IndiTech’s offerings of Continuous Blowdown Valves include:

1) An Angle Type Continuous Blowdown Valve features a needle-shaped trim within a venturi diffuser. This diffuser offers ample space for high-velocity flashing water, preventing choked flow.

2) Regulating Lever Continuous Blowdown valve with straight pattern design.

Intermittent Blowdown Valve (IBD):

IBD valves are designed to open at predetermined intervals or under specific conditions. When open, they release water and, accumulated sludge and sediment from the bottom of the boiler. The primary requirement of these valves is providing tight shut-off, even after repetitive blowdown operations.

IndiTech’s offerings of Intermittent Blowdown Valves include:

1) An Angle Type Intermittent Blowdown Valve featuring a multi-step throttling plug that allows to carry out dual functions – blowdown in the open position and sealing in the closed position. Since the total pressure drop gets divided across each stage, the area for sealing is separate from the throttling area, which minimises erosion and ensures a leak-proof performance even after extensive use.

2) A Lever-Operated quick-action blowdown valve, which, when operated, creates a suction effect in the boiler, thereby causing the thicker sludge deposits to be flushed out. The valve then closes automatically as soon as the lever is let loose. This fast opening and closing ensures minimum loss of boiler feed water.

Technical Data

INDITECH SERIES

320

SIZE

ANSINPS 1 To NPS 3 (DN25 To DN80)

PRESSURE RATING

ANSI CL300 To CL2500

BODY MATERIAL

A105; A182 F11/F22/F91/F316

END CONNECTIONS

Flanged/Socket Weld/Butt Weld

LEAKAGE CLASS

Class IV/Class V

OPERATION

Motorised/Lever Operated/Manual

Features

Forged body suited for severe service blowdown duty due to excellent body integrity and strength as compared to cast bodies
Stellited plug-spindle & seat for resistance against erosion and wire drawing, avoiding premature valve failure
Integral plug-spindle for vibration and chatter-free operation
Extra-long gland packing for tight seal at high temperatures

Specific Advantages of IndiTech Angle Type Blowdown Valves

Angle design ensures self-draining of the blowdown valve
Single-step trim with venturi diffuser for continuous operation and multi-step pressure-reducing trim for Intermittent operation valve
Pressure seal bonnet for high-pressure applications
Compact or Heavy-Duty design options available

Specific Advantages of IndiTech Lever-Operated Blowdown Valves

Fast opening and closing facilitated by lever & spring-return mechanism
Pin for locking valve in closed position (lever up) or in open position for draining boiler (lever down)