BLV and SPV ball valves

Ball valves of type BLV and SPV are designed for shutting off the flow of water and other media in high-pressure pipeline systems within hydroelectric power plants. TB Hydro designs, manufactures, and services this type of ball valve.

Diameter:

Wide range of diameters from 150 to 2000 mm.

Pressure:

Pressure range from 6 to 200 bar.

Ball valve design

Body

The body can be in a 2- or 3-piece design. It is available in the following versions welded from plates and forgings, bolted from forgings and cast

Ball

The ball, as the closing element, can be manufactured as a welded, forged, or cast component. In every variant, the ball features a full bore.

Main Seal

Type BLV soft seal - a polyurethane profile secured to the ball by a clamping ring. The mating surface in the body is made as a stainless, replaceable ring.
Type SPV metal/metal seal - A movable stainless ring seated in the body, water-controlled, cooperating with a stationary stainless ring seated in the ball.

Maintenance Seal

metal/metal - A movable stainless ring seated in the body, water-controlled, cooperating with a stationary stainless ring seated in the ball.

Shafts

Stainless steel shafts are rigidly connected to the ball using pins or bolted with tensioned screws, in which case torque is transmitted via bushings.

Bearings

The shafts are supported in the body by maintenance-free, self-lubricating bearings. A double sealing system is used: an internal seal protects the bearings from contamination by the flowing medium, and an external seal ensures tightness in case of damage to the internal seal. The space between the seals is equipped with a control leakage port.

Actuator

The actuator can be:

Single-sided, mounted from any side
Double-sided

Standard configurations include:

A counterweight for closing and a single-acting hydraulic cylinder for opening. The direction of the counterweight's descent is adjustable.

Optional actuators:

Double-acting hydraulic or water cylinder
Hydro-oil cylinder (water for closing, oil for opening)
Electric actuator with worm gear
Manual actuator with worm gear

Ball Valve Types and Equipment

Ball Valve Types:

Type BLV - ball valve with a soft seal and eccentrically mounted ball.
Type SPV - ball valve with a metal/metal seal and centrally mounted ball.

Both types can come in the following versions:

2-piece body: welded, forged, or cast
3-piece body: forged
With or without an inspection seal

Standard Ball Valve Equipment:

Connection flanges typically with threaded holes, or optionally with through-holes
Legs
Lifting lugs
Vent and drain ports
Limit switches for closed/open positions
Visual position indicator
Mechanical lock in the valve's closed position

Optional Ball Valve Equipment:

Additional connections
Mechanical lock in the open position
Additional electrical and hydraulic equipment, terminal box, hydraulic hoses
Water control system, filters, sand separator (settling tank)
Oil hydraulic control system
Hydraulic power unit
Electrical control panel
Additional bearing sleeves allowing bearing removal without valve disassembly
Bearings with emergency lubrication capability
Automatic lubrication systems
2-stage actuator with adjustable valve closing characteristic

Materials

Basic materials used in our products. Other materials may be used according to customer requirements and their suitable application.

Element	Type	Material
Bodies, Closing Elements	Plates	S355J2+N
	Forgings	S355J2G3
	Pipes	S355J2H
	Castings	G20Mn5
Shafts, Pins	Rods	1.4021 / 1.4313 / 1.4418
Sealing Surfaces	Plates	1.4301
Sealing Surfaces	Flat Bar	1.4301
Soft Main Seals	Bonded Cord - Special Profile	NBR 80Sh
Soft Main Seals	Machined Gasket / Lathe-Cut Seal	Polyurethane
Metal Main Seals	Plates	1.4301
Metal Main Seals	Forgings	1.4006 / 1.4021 / 1.4057 / 1.4301 / 1.4313
Bolts, Nuts	Contact with Air	8.8 / 8 Galvanized Steel
Bolts, Nuts	Contact with Water	A2-70 / A4-80
Bearings	Maintenance-Free, Self-Lubricating	-
Corrosion Protection	2-Component Epoxy Paints	-