Danfoss KDC 65-200 Data sheet

Data Sheet

Pressure control valve
Type KDC 65-200

Ecient control of excessive discharge pressure

The KDC valve is a pressure control valve . The
valve controls the discharge pressure of the
compressor to ensure fast build-up of pressure
and lubrication pressure. The valve also acts as
a check valve in the discharge line of the
compressor.

The KDC valve is force-controlled so that when
pressure in the oil separator becomes 2 bar (29
psi) higher than the suction pressure, the
spring is compressed and the valve opens. In
lowpressure units (boosters), the spring
requires a dierential pressure of 0.5 bar (7 psi)
for the valve to open.

Features

• Applicable to HCFC, HFC, R717(Ammonia)
and R744 (CO2).

• Each valve type is clearly marked with type,
size and performance range

• Angle valves with weld connections

• Fast build-up of oil pressure in oil separator
during start-up.

• High closing force on the cone during
standstill, even without dierential pressure
across the valve

• Very low pressure drop because of spring
force

• Low part-load without risk of valve chattering

• Stainless steel bolts

• Housing and bonnet material is in low
temperature steel according to requirements
of the Pressure Equipment Directive and
other international classication authorities

• Pressure range: 40 bar (580 psig)

• Temperature range: -50 °C / +150 °C (-58 °F /
+302 °F)

• Classication: DNV, CRN, BV, EAC etc. To get
an updated list of certication on the
products please contact your local Danfoss
Sales Company.

AI225686433549en-001001

Pressure control valve, type KDC 65-200

Functions

The KDC valve opens in a 3 step sequence. The sequence of steps depends on the start-up situation (see Figure 1:

KDC valve).

Step 1

The valve is always closed by a minimum dierential pressure of 1.5 to 2.0 bar (0.3 to 0.5 bar in a booster system).
Step 1 will occur when the compressor is stopped and the discharge pressure has equalized to the top of the valve
through the suction side of the compressor.

pc – p1 < 2 bar (0.5 bar for booster) and pc > p

2

Step 2

Step 2 will occur as soon as the condensing pressure becomes higher than the pressure in the oil separator, and
when the dierential pressure between suction side and condensing pressure is bigger than the spring force.

pc – p1 > 2 bar (0.5 bar for booster) and pc > p

2

When the compressor starts the valve will either be in step 1 or step 2 position, depending on the pressure
dierence between the oil separator and the condensing pressure.

Start up situation 1

Condensing pressure is lower than oil separator pressure.

Start up will occur from step 1 position and go to step 3 as soon as a dierential pressure between suction side and
oil separator that can overcome the spring force is present.

Start up situation 2

Condensing pressure is higher than oil separator pressure but the dierential pressure is lower than the spring force.

Start up will occur from step 1 and go to step 2 when dierential pressure between suction side and condensing
pressure is bigger than the spring force. When oil separator pressure comes close to the condensing pressure the
valve will start opening and the small spring will open the valve completely. The valve will then be in step 3 position.

Start up situation 3

Condensing pressure is higher than oil separator pressure + spring force pressure. Start up will occur from step 2
position.

When oil separator pressure comes close to the condensing pressure the valve will start opening and the small
spring will open the valve completely. The valve will then be in step 3 position.

When the compressor stops, the valve will be in step 3 position and as soon as the condensing pressure has
equalized to the suction side the spring force will close the valve. The valve will be in step 1 position until enough
dierential pressure between condensing pressure and oil separator/suction side pressure occurs for the valve to
enter into step 2 position.



NOTE:

The KDC valve cannot be used on compressor units where the non-return valve is placed between compressor and
oil separator instead of on the suction side of the compressor. The reason for this is that the KDC valve needs to have
the pilot pipe connected to a point on the compressor unit, where the pressure is low during running and high
during standstill.

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Step 1 Step 2 Step 3

System with KDC valve

System without KDC valve

Time

Pressure difference (p₂ -p₁)

Pressure control valve, type KDC 65-200

Figure 1: KDC valve

Figure 2: Time and Pressure dierence graph

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KDC valve

p

c

Screw

compressor

Oil separator

p

1

p

2

Pressure control valve, type KDC 65-200

Applications

Example

Figure 3: Compressor discharge line after oil separator

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Pressure control valve, type KDC 65-200

Media

Refrigerants

Applicable to HCFC, HFC, R717(Ammonia) and R744 (CO2).

For further information please see installation instruction for KDC.

New refrigerants

Danfoss products are continually evaluated for use with new refrigerants depending on market requirements.

When a refrigerant is approved for use by Danfoss, it is added to the relevant portfolio, and the R number of the
refrigerant (e.g. R513A) will be added to the technical data of the code number. Therefore, products for specic
refrigerants are best checked at store.danfoss.com/en/, or by contacting your local Danfoss representative.

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Description

Values

Temperature range

-50 °C / +150 °C (-58 °F / +302 °F)

Pressure range
The valves are designed for max. working pressure

40 bar (580 psig)

Pressure control valve, type KDC 65-200

Product specication

Pressure and temperature

Table 1: Pressure and temperature

Design

Housing

Made of special, cold resistant steel approved for low temperature operations.

Valve cone

The valve cone has two teon tightening rings with built-in metallic stops to prevent damage to the teon rings in
case of an extreme pressure dierence.

Spindle

The spindle is made of gas-tempered steel. Consequently the valve spindle has an extremely hard and smooth
surface. The valve rod has an internal weak spring (Figure 4: KDC, pos. 13), which is active when the servo piston is in
upright position.

Actuator

The KDC actuator has one chamber. It is separated from the main ow by a piston (Figure 4: KDC, pos. 6). The
chamber has a spring (Figure 4: KDC, pos. 14) which provides dierential opening of the valve. The chamber of the
actuator is connected to the suction line of the compressor.

Installation

The valve must be mounted vertically with the cone in downward position. On top of the bonnet the actuator has
one threaded (NPT 1/4 in.) connection (Figure 4: KDC, pos. A) for the pilot line. Fittings for connection of steel pipe
DN 10 (do/di = 10/6 mm) by means of cutting rings. The valve is designed to resist very high internal pressure, but as
to the pipe system in general, hydraulic pressure caused by thermal expansions in entrapped refrigerants should be
avoided.

For further information please refer to KDC installation instruction.

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T

ØD

Danfoss

A148B15.10

SizemmSize

in.ODmmTmmODin.Tin.

kv-angle

m3/h

Cv-angle

USgal/min

652½76.1

2.930.117890

80

10034

88.9

114.3

3.2

3.6

3.50

4.50

0.13

0.14

118
203

137
235

125
150
200

5
6
8

139.7

168.3

219.1

4.0

4.5

6.3

5.50

6.63

8.63

0.16

0.18

0.25

333
509
757

386
590
878

Pressure control valve, type KDC 65-200

Figure 4: KDC Figure 5: Example of ID-plate for KDC

Connections

Available with the following connections:

• Butt-weld DIN (2448)

• Butt-weld ANSI (B 36.10 Schedule 40), DN 65 - 200 (2½ - 8 in.)

Figure 6: DIN

Table 2: Butt-weld DIN (2448)

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T

ØD

SizemmSize

in.ODmmTmmODin.Tin.

kv-angle

m3/h

Cv-angle

USgal/min

652½73.0

5.2

2.87

0.207890

80

10034

88.9

114.3

5.5

6.0

3.50

4.50

0.22

0.24

118
203

137
235

125
150
200

5
6
8

141.3

168.3

219.1

6.6

7.1

8.2

5.56

6.63

8.63

0.26

0.28

0.32

333
509
757

386
590
878

KDC 65

KDC 80

KDC 100

KDC 125

KDC 150

KDC 200

R717

434

656

1128

1851

2829

4207

R404A

132

200

344

564

863

1283

R22

157

238

410

672

1028

1528

KDC 65

KDC 80

KDC 100

KDC 125

KDC 150

KDC 200

R717

229

347

597

978

1496

2225

R404A

101

153

263

432

661

983

R22

102

154

265

435

665

990

Pressure control valve, type KDC 65-200

Figure 7: ANSI

Table 3: Butt-weld DIN (2448)

Nominal capacities

High pressure compressor

Capacity table at tc / to = +35 °C / -15 °C,
QN [kW],
Δp = 0.05 bar

Table 4: Capacity table

Booster compressor

Capacity table at tc / to = -18 °C / -40 °C,
QN [kW],
Δp = 0.05 bar

Table 5: Capacity table

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No.

Part

Material

EN

ISO

ASTM

1

Valve House

Steel

G20Mn5QT
EN10213-3

LCC
A352

2

Bonnet

Steel

P285QH
EN10222-4

LF2
A350

3

Piston

Steel

S235JRG2
EN10025

Fe260B
630

Grade C
A283

4

Piston rod

Steel

S235JRG2
EN10025

Fe260B
630

Grade C
A283

5

Piston

Steel

11SMn30
EN10087

Type 2
R683/9

Grade 1213
A29

6

Cone

Steel

11SMn30
EN10087

Type 2
R683/9

Grade 1213
A29

7

Screw for spring

Steel

11SMn30
EN10087

Type 2
R683/9

Grade 1213
A29

8

Bushing for spring

Cast iron

9

Cone plate

Steel

11SMn30
EN10087

Type 2
R683/9

Grade 1213
A29

10

Cone rod

Steel

11SMn30
EN10087

Type 2
R683/9

Grade 1213
A29

11

Rear bushing

Cast iron

12

Front bushing

Cast iron

13

Spring for cone

Steel14Spring

Steel16Teon ring

PTFE

17

Gasket

Fiber gasket
non-asbestos

18

Washer

Nylon19Glide ring

PTFE

Pressure control valve, type KDC 65-200

Material specication

Figure 8: KDC 65 - 200 (2½ - 8 in.)

Table 6: Material and Parts list

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No.

Part

Material

EN

ISO

ASTM

20

O-ring
Cloroprene (Neoprene)

(Standard KDC)

FKM
(Hydrocarbon KDC)

21

O-ring
Cloroprene (Neoprene)

(Standard KDC)

FKM
(Hydrocarbon KDC)

22

O-ring
Cloroprene (Neoprene)

(Standard KDC)

FKM
(Hydrocarbon KDC)

23

Retaining ring bore

Steel24Spring ring

Steel25Spring ring

Steel26Nut

Steel

27

Bolts

Steel

A2-70
EN1515-1

A2-70
3506

Grade B8
A320

28

ID plate

Aluminium

29

Driv screw

Steel30Washer

Steel31Nut

Steel32Screw

Steel

Pressure control valve, type KDC 65-200

Dimensions and weights

Figure 9: KDC 65 - 200 (2½ - 8 in.)

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Valve size

ABCØDWeight

KDC 65mm2506290427.3 kg

KDC 2½

in.

9.84

2.44

3.54

1.65

16.1 lb

KDC 80mm298901295111.1 kg

KDC 3

in.

11.73

3.54

5.08

2.01

24.5 lb

KDC 100mm346

106

1566417.3 kg

KDC 4

in.

13.62

4.17

6.14

2.52

38.1 lb

KDC 125mm407

128

1926436.9 kg

KDC 5

in.

16.02

5.04

7.56

2.52

81.3 lb

KDC 150mm471

145

2197549.9 kg

KDC 6

in.

18.54

5.71

8.62

2.95

110.0 lb

KDC 200mm539

180

2767599.6 kg

KDC 8

in.

21.22

7.09

10.87

2.95

219.6 lb

Pressure control valve, type KDC 65-200

Table 7: KDC types

NOTE:



Specied weights are approximate values only.

Bolt in top of the valve is for transportation purposes only. For further information please see installation instruction.

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Size

Type

bar

Code no.

mm

in.

652½KDC 65

0.5
2
3

148G3585
148G3586
148G3713

803KDC 80

0.5
2
3

148G3589
148G3590
148G3714

1004KDC 100

0.5
2
3

148G3593
148G3594
148G3715

1255KDC 125

0.5
2
3

148G3597
148G3598
148G3716

1506KDC 150

0.52148G3601

148G3602

2008KDC 200

0.52148G3605

148G3606

Size

Type

bar

Code no.

mm

in.

652½KDC 65

0.5
2
3

148G3587
148G3588
148G3811

803KDC 80

0.5
2
3

148G3591
148G3592
148G3812

1004KDC 100

0.5
2
3

148G3595
148G3596
148G3813

1255KDC 125

0.52148G3599

148G3600

1506KDC 150

0.52148G3603

148G3604

2008KDC 200

0.52148G3607

148G3608

Size

Type

bar

Code no.

mm

in.

652½KDC 65

0.52148G3825

148G3831

803KDC 80

0.52148G3826

148G3832

1004KDC 100

0.52148G3827

148G3833

1255KDC 125

0.52148G3828

148G3834

1506KDC 150

0.52148G3829

148G3835

2008KDC 200

0.52148G3830

148G3836

Pressure control valve, type KDC 65-200

Ordering

 IMPORTANT:

Where products need to be certied according to specic certication societies or where higher pressures are
required, the relevant information should be included at the time of ordering.

Table 8: Standard KDC with welding branches - DIN

Table 9: Standard KDC with welding branches - ANSI

 NOTE:

The HYDROCARBON versions of the KDC valves are not compatiable with Ammonia as refrigerant. They can only be
used in systems with HYDROCARBON as refrigerant.

Table 10: Standard KDC with welding branches - ANSI

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Type

Code no.

GASKET BONNET/HOUSING KDC/GVD 65

148G3048

GASKET BONNET/HOUSING KDC/GVD 80

148G3049

GASKET BONNET/HOUSING KDC/GVD 100

148G3050

GASKET BONNET/HOUSING KDC/GVD 125

148G3051

GASKET BONNET/HOUSING KDC/GVD 150

148G3052

GASKET BONNET/HOUSING KDC/GVD 200

148G3053

Type

Code no.

SEAL KIT SET KDC/GVD 65

148G3054

SEAL KIT SET KDC/GVD 80

148G3055

SEAL KIT SET KDC/GVD 100

148G3056

SEAL KIT SET KDC/GVD 125

148G3057

SEAL KIT SET KDC/GVD 150

148G3058

SEAL KIT SET KDC/GVD 200

148G3059

Type

Code no.

SEAL KIT SET KDC/GVD 65 Hydrocarbon

148G3837

SEAL KIT SET KDC/GVD 80 Hydrocarbon

148G3838

SEAL KIT SET KDC/GVD 100 Hydrocarbon

148G3839

SEAL KIT SET KDC/GVD 125 Hydrocarbon

148G3840

SEAL KIT SET KDC/GVD 150 Hydrocarbon

148G3841

SEAL KIT SET KDC/GVD 200 Hydrocarbon

148G3842

Pressure control valve, type KDC 65-200

Spare parts and accessories

Table 11: Spare parts

Table 12: Seal kit

Table 13: Seal kit

 NOTE:

The HYDROCARBON versions of the seal kits are not compatible with Ammonia as refrigerant. They can only be used
in systems with HYDROCARBON as refrigerant.

The seal kit

Figure 10: The seal kit

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No.

Part

Material

16

Teon ring

PTFE17Gasket

Fiber gasket non-asbestos

18

Washer

Nylon19Glide ring

PTFE

20-22

O-ring

- Standard valve

- Hydrocarbon valve

Cloroprene (Neoprene) Viton

Pressure control valve, type KDC 65-200

Table 14: The seal kit

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KDC valves are approved according to the European standard specied in the Pressure Equipment Directive and are CE

marked.

KDC valves

Nominal bore

DN65-80 mm (1¼ - 3 in.)

DN100 - 200 mm (4-8 in.)

Classied for

Fluid group I

Category

II

III

File name

Document type

Document topic

Approval authority

RU Д-DK.БЛ08.В.00191_18

EAC Declaration

Machinery & Equipment

EAC

0045 202 1204 Z 00354 19 D 001(00)

Pressure - Safety Certicate

-

TÜV

03709-F0 BV

Marine - Safety Certicate

-BVTSX71002520151142

Manufacturing Permission

-

GMPI

RU Д-DK.РА01.B.72054_20

EAC Declaration

PED

EAC

RU C-DK.БЛ08.B.01093_20

Pressure - Safety Certicate

PED

EAC

GL TAP0000001 Rev. 1

Marine - Safety Certicate

-

DNV GL

033F0685.AK

EU Declaration

EMCD/PED

Danfoss

033F0691.AE

Manufacturers Declaration

RoHS

Danfoss

0045 202 1204 Z 00355 19 D 001(00)

Pressure - Safety Certicate

-

TÜV

19.10048.266

Marine - Safety Certicate

-

RMRS

Pressure control valve, type KDC 65-200

Certicates, declarations, and approvals

The list contains all certicates, declarations, and approvals for this product type. Individual code number may have
some or all of these approvals, and certain local approvals may not appear on the list.

Some approvals may change over time. You can check the most current status at danfoss.com or contact your local
Danfoss representative if you have any questions.

Table 15: Pressure Equipment Directive (PED)

For further details / restrictions - see Installation Instruction.

Table 16: KDC valves

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