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DI NICOLA INFINAM
Howell Bunger valve

Howell Bunger valve

Product catalog summary

Company Overview
Di Nicola specializes in the design and manufacturing of outlet cone fixed valves, including Hollow jet and Howell Bunger type valves. These valves are designed to improve client processes by avoiding cavitation and vibrations, thus reducing operational and maintenance costs. The valves are made from EN S275J0 steel and stainless steel with high nickel content, available in sizes from 200 to 2000 mm and nominal pressures from 2.5 bar to 64 bar. Di Nicola offers customized solutions based on specific operational and installation conditions.

Application
The Di Nicola Outlet bottom Dam Fixed Cone, Hollow jet, and Howell Bunger type valves are used to regulate flow from dams and reservoirs. These valves are commonly used as turbine bypass valves, reservoir drains, or continuous discharge flow control valves. They are designed to eliminate vibration problems and can be installed in various configurations, including standard open discharge, with a hood pipe for concentrated flow, submerged for energy dissipation, and vertical discharge in closed or semi-open chambers.

Design Specifications
The valves are designed to operate without cavitation or vibration throughout their range. They feature a metal/EPDM "O" ring seated design for drip-tight shut-off. The unique design avoids blocking and breaking of adjusting springs, a common issue in competitor designs.

Valve Body
The valve body is cylindrical, designed to connect to a conduit or pipe. It includes an EPDM "O" Ring seal that is replaceable and encapsulated by a stainless steel retaining body. The body incorporates vanes and stabilizers to prevent vibration during operation. It also features a rear seal groove to prevent leakage.

Materials
The document lists various materials used in the construction of the valves, including stainless steel, S275J0/R steel, and NBR for seals.

Valve Sleeve Obturator
The sleeve obturator is cylindrical and uses linear motion to open and close the valve. It is machined in a conical shape for certain versions and uses an internal EPDM "O" Ring seal for seating.

Testing
The valves undergo hydrostatic testing at 1.5 times the working pressure for 10 minutes to ensure no leakage at welded areas or through the body. The body and gate seat must be drip-tight when closed.

Hoods
Hoods are used to direct discharge and are part of the valve's design to manage flow effectively.

Performance Data
The document includes performance data such as pressure factor curves and discharge coefficients determined from a 6-inch hydraulic model. It also provides details on head, vertical inclination, and other factors affecting valve performance.

Catalog excerpts

Our ﬁrm reserves the right to make any technical changes without any notice to the client.

Open the catalog to page 2

Over the years, Di Nicola has improved the design and manufacturing of Outlet cone fixed valves improving clients’ processes, avoiding cavitation phenomena, vibrations and reduce their operation and maintenance costs long lasting. Our products are developed to meet and surpass even the most difficult conditions. Di Nicola manufacture outlet bottom dam valves cone , Hollow jet and Howell Bunger type open drain, room dissipation, or discharge submerged under construction EN S275J0 steel and stainless steel with high nickel content with sizes between 200 and 2000 mm and nominal pressures from 2.5...

Open the catalog to page 3

05 Valve Sleeve obturator The valve shall be designed as a free dising throughout its range without cavitation or vibration. The valve shall be metal/EPDM “O” ring seated achieving drip tight shut off. Di Nicola valve is the one and only Fixed cone Howell bunger valve with new “free spring sleeve design” avoiding any blocking due to breaking of adjusting springs located on the sleeve obturator in common competitors design. The sleeve obturator is cylindrical and uses a linear motion to open and close the valve. In A , B and C version the gate seat is in St.st 304 /316 machined in conical shape...

Open the catalog to page 4

NOTE H= Total head * h + 12aV h= Static head one diameter upstream Q a =Inlet area sq.ft c= A√2gh F= Measured piez. head PRESSURE FACTOR, F COEFFICENT OF DISCHARGE, C valve opening HOWELL - BURGER VALVE STUDIES COEFFICIENT AND PRESSURE FACTOR CURVES PRESSURES AND CHARACTERISTICS DETERMINED FROM 6-INCH HYDRAULIC MODEL VALVE DISCHARGING INTO ATMOSPHERE Dis. free - Hood in place Dis. free - Hood in removed Our ﬁrm reserves the right to make any technical changes without any notice to the client

Open the catalog to page 6

Lateral view Hard rain area Hard rain area Medium rain area Low rain area Embedded conveyor ring Head: 35 m H2O vertical inclination of HB valve : 0° Air resistance: not considered dissipation phenomena: not considered action of wind: not considered Our ﬁrm reserves the right to make any technical changes without any notice to the client.

Open the catalog to page 7

Howell Bunger valve

Howell Bunger valve

Catalog excerpts

All DI NICOLA INFINAM catalogs and technical brochures