1. Control valves
Technical specifications (maximum)

Nominal diameter:
Nominal pressure:
Design temperature:
Pressure drop:
Actuator:
Working fluid:

900 mm
25,0 MPa
550 С°
full (up to 25 MPa)
Manual, electrical
Boric acid solution, water, steam, gas, primary circuit coolant, steam-water mixture

Cage-type valve design has the following advantages:

Great control range owing to the different combinations of pull-out parts.

Assurance of linear characteristic according to the Customer's request.

Noise and cavitation levels decrease.

Long lifetime owing to lack of erosion, cavitation, eddies, noises and vibrations.

Lack of welding joints in the valve design.

Pull-out parts replacement possibility without any cuttings out of pipeline.

2. QUICK-ACTING RELIEF valves
Type for VVER :

BRU-A     (Steam dump to atmosphere)
BRU-K     (Steam dump to condenser)
BRU-D     (Steam supply to second circuit deaerator)
BRU-SN   (Auxiliaries)
BRU-TFU (Heating installation systems)

Type ОК.300/400.АВ.122E
Type ОК.300/350.АВ.122E
Type ОК.150/600.АВ.132E
Type ОК.100/500.АВ.132E
Type ОК.125/500.АВ.132E

Quick-acting relief valves (BRU) characteristics are calculated at NPP General Designer requests.

3. THREE-WAY ISOLATION CONTROL VALVES
Technical specifications (maximum):

Nominal diameter:
Nominal pressure:
Design temperature:
Pressure drop:
Actuator:
Working fluid:

800 mm
25,0 MPa
550 С°
Full (up to 25 MPa)
Manual, electrical actuation
Air, boric acid solution, water, primary circuit coolant, steam, gas, steam-water mixture, chemical solutions

VVER types:

Control valve of residual heal removal system (JNA);

Control valve of intermediate cooling circuit of KAA important consumers cooling system

Type ОК.300/300/300.АВ.322E


Type ОК.500/400/400.АВ.322E

4. Lock Valves

Specific lock valves with design cutting out cavitations and noises and keeping high level capacity are included in the OKAN deliverables. Product line is provided upon request. 

1. GATE VALVES
Technical specifications (maximum):

Nominal diameter:
Nominal pressure:
Design temperature:
Pressure drop:
Actuator:
Working fluid:

1200 mm
25,0 MPa
550 С°
Full (up to 25 MPa)
Manual, electrical actuation
Boric acid solution, water, primary circuit coolant, steam, gas,
steam-water mixture, chemical solution

Overpressure protection device:

At Customer’s request gate valves
equipped with protection device
located in the gate valve cavity to prevent overpressure during the process of heating can be delivered.

2. Globe VALVES
Technical specifications (maximum):

Nominal diameter:
Nominal pressure:
Design temperature:
Packing type:
Actuator:
Working fluid:

900 mm
25,0 MPa
550 С°
Bellows, gland stuffing box
Manual, electrical actuation
Boric acid solution, water, primary circuit coolant, steam, gas, steam-water mixture, chemical solutions

3. butterfly valves
Technical specifications (maximum):

Nominal diameter:
Nominal pressure::
Design temperature:
Working fluid:

2000 mm
25,0 MPa
550 С°
Air, boric acid solution, water, primary circuit coolant, steam, gas, steam-water mixture, chemical solutions, air

4. ball VALVES
Technical specifications (maximum):

Nominal diameter:
Nominal pressure:
Design temperature:
Actuator:
Working fluid:

300 mm
25,0 MPa
550 С°
Manual, electrical actuation
Pulp, boric acid solution, water, steam, gas,steam-water mixture,
chemical solutions

Features of ball valves created specially for highly contaminated
mediums:

effect of valve seats double sealing: radial three-piece double-sided sealing of the seat ensures the gate tightness by means of "inlet" and "outlet" seat

lack of inner closed cavities: prevent possible ingress of contamination

additional set of disk springs fulfill a protection function against mechanical admixtures ingress into clearances

1. swing CHECK VALVES
Technical specifications (maximum):

Nominal diameter:
Nominal pressure:
Design temperature:
Working fluid:

1200 mm
25,0 MPa
550 С°
Air, boric acid solution, water, primary circuit coolant, steam, gas, steam-water mixture, chemical solutions

2. Piston check valves
Technical specifications (maximum):

Nominal diameter:
Nominal pressure:
Design temperature:
Working fluid:

1200 mm
30 MPa
550 С°
Air, boric acid solution, water, primary circuit coolant, steam, gas, steam-water mixture, chemical solutions

Types of stick sealings:
Three basic kinds of stick sealings are used in the valves design to seal out movable joints from environmental factors:

GLAND STUFFING BOX

DOUBLE GLAND STUFFING BOX

BELLOWS

Production and delivery of cast of complex shapes, high quality forging, valves pull-out parts and components are provided through the cooperation between OKAN and leading international companies.

Forging 
up to 120 tons

Casting 
up to 80 tons

VALVE PULL-OUT
PARTS

Besides valves production and engineering activities OKAN in cooperation with high-tech companies provides a wide range of customized production services:

Performance of overlaying welding bu means of argon or plasma arc technologies (Stellite, Hastelloy, Monel, Colmonoy);

Application of coatings (chemical, galvanic, electrolytic, anodic, diffusion);

Precision mechanical handling;

Metallurgy prefabrication;

Matching, completing and procurement of import equipment.