BLOW-DOWN & DRAIN VALVES
Bont's wide range of Blow-Down & Drain Valves
can comply with any Customer request
Steel Valves Type BLB
ANSI 1700, 2700, 4500 lb
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 differential pressure.
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
sometimes abrasive particles.
The outlet of valves is purposely "Venturi tube" shaped;
stem is rising non rotating; a local stroke indicator shows the position
of the disk.
In spite of the above mentione features, it can happen that these
valves-after some operating time-are not able to ensure a tight seal, since
even a slow acting erosion deteriorates the working surfaces of the
disk and seat. What above does not affect its function.
The bonnetless design enables easy dismantling, inspection and maintenance.
Valve dimension must be selected according to the operating conditions.
for Continuous Blowdown
Forged Steel Valves Type BPR
for Blowdown/Blowoff with Zero Leakage after Closing Operation
1700, 2700, 4500 lb
A standard blowdown or blowoff valve does not assure a tight sealing
after some operating period: this is due to the normal erosion made
by fluid between seat and disk; in case tight seal is needed, this
function was performed in the past by a second valve.
Our new valve BPR carries out both functions-blowoff and tight seal-in
sequence and namely: blowoff with valve suitably 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.
Design of the disk, of the fluid path inside the valve as well the
materials are suitable to operate with high differential pressure,
therefore usually with critical flow. The consequences of these
critical flows of water/steam must not affect geometry and finishing of
the sealing suface, to ensure tight sealing.
This problem has been succesfully solved by our new and innovative design.
Valve dimension must be choosen according to the operating conditions.
Steel Ball Valve for
Boiler Drain and Blowdown (Patented)
BONT® "RSS" valve is an absolute innovation.
valve has been designed
specifically for Boiler Blowdown.
The two seats (Cesare Bonetti Patented) are manufactured from a "Special
Compound" material combining metal and special graphite which
makes the valve suitable to withstand high pressure and temperatures.
The sealing system has been carefully designed to avoid contacts
of the fluid stream with the downstream seat during the normal blow-down
and during the opening and closing operation.
Therefore the said seat will be never damaged by the fluid velocity.
The tightness is assured for an illimitated number of operation.
Up to now we may say at least 40.000 cycles.
After extenive tests carried out on field, toghether with exaustive
laboratory testing, this Ball Valve has proven to be the most efficient,
maintenance & troubles free and cost effective "Blowdown Valve".
The valve can be manually operated, Pneumatically actuated (air to open
spring to close) and electronically driven by a microprocessor specifically
Features: PN 40 DIN 2401 - DN 25, 32, 40
ANSI 300 lb - DN 1", 1¼", 1½"
Screwed, SW and Flanged ends according European or American Standards.