Danfoss BSV-8 Data sheet

Data Sheet

Safety relief valves
Type BSV-8

Used as pressure limiting devices to protect
hydraulic systems and components

BSV is a standard, back pressure independent
safety relief valve, especially designed for
protection of small components against
excessive pressure and as a pilot valve for the
pilot operated internal safety valve, type POV.

BSV is an angle-way safety relief valve which
can operate with a very high back pressure. The
valve is designed to meet the strict quality
demands and safety requirements for
refrigeration installations, specied by the
international classication societies.

As the valve is not dependent on the back
pressure, it is recommended for use as an
internal safety relief valve. However, the valve
can also be used as an external safety relief
valve. The spring housing is tightly sealed to
avoid refrigerant leakage.

The inlet ow diameter of the BSV 8 is 8.0 mm

5

(

⁄16 in.).

The valves can be delivered with set pressures
between 10 and 25 bar (145 and 363 psig).

Standard pressure setting valves having "TÜV
Pressure Setting Certicate" with each valve are
also available.

Features:

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

Company.

AI183186419214en-000702

Safety relief valves, Type BSV-8

Media

Refrigerants

Applicable for the refrigerants HCFC, HFC, R717 (Ammonia), R744 (CO2). Flammable hydrocarbons are not
recommended. For further information please contact your local Danfoss Sales Company.

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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Working pressure

Reseating pressure

Set pressure p

Opening pressure

p + 10%

p – 10%

0 100%

Safety relief valves, Type BSV-8

Product specication

Design

BSV is designed as a standard safety relief valve (DIN 3320) which are recommended for refrigeration plants. On a
rise in pressure above the set pressure, the safety relief valve will initially start opening slightly, to minimise the
outlet of refrigerant. If the pressure continues to increase, the valve will open fully. The safety relief valve will be fully
open before the pressure is 10% higher than set pressure, and fully closed before the pressure is 10% below set
pressure.

The valve is recommended as an internal safety relief valve because its function is independent of the back pressure.
The valve can also be used as an external safety relief valve.

Figure 1: Design

Pressure and temperature data

Pressure

Pressure setting range: 10 – 25 bar (145 – 363 psig), For further information please contact your local Danfoss Sales

Company.

The valves are designed for:
Strength test: 43 bar (624 psig)
Leakage safety: 25 bar (363 psig)
Special circumstances such as vibrations (which should be avoided) and oscillating pressure may require an
increased dierence between the operational pressure and the closing pressure.

Pressure setting

The operating pressure of the plant should be at least 15% below the set pressure. This allows a perfect re-seating of
the safety relief valve after having been activated.

Temperature range for BSV used as an external safety relief valve:

-30 °C /+ 100 °C (-22 °F /+ 212 °F)

Temperature range for BSV used as a pilot valve for POV:

-50 °C /+ 100 °C (-58 °F /+ 212 °F)



NOTE:

For temperatures below -30 °C (-22 °F), the valve may not re-seat to a 100% gas tightness when activated.

Housing

Made of special steel approved for low temperature application. Spindle and seat are made of stainless steel, to
ensure precise operation even during extraordinary conditions. The gasket of the valve cone is made of a special
neoprene compound.

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21

2

3

17

6

12

13

11

10

8

7

1

Danfoss

M148F0001_1

No.

Part

Material

DIN

ISO

ASTM

1

Housing

Steel

TT St 35 N/V, 17173

TW 6, 2604/3‑75

Grade 1, A333, A334

A350 LF2

(1)

2

Threaded plug

Steel

9S Mn28
1651 - 88

11S Mn28
630/9 - 88

1213

SAE J 403

3

Valve top

Steel

St. 37.2, 1652 - 2 - 90

Fe 360 B, 660 - 80

Grade C, A 283

6

Bellow

Stainless steel

7

Gasket

Aluminium

8

Valve seat

Stainless steel

10

O-ring

Cloroprene (Neoprene)

11

Valve cone

Steel12Spring

Steel

Class C, 17223-1-84

A 679SAE J 403

13

O-ring

Cloroprene (Neoprene)

17

Gasket

Aluminium

21

Marking label

Aluminium

Safety relief valves, Type BSV-8

Material specication

Figure 2: BSV-8

Table 1: Material specication

(1)

(1)

Alternative material

Alternative material

Installation

To ensure exact operation of the safety relief valve it should be installed with the spring housing upwards. If the
valve is mounted as an internal safety relief valve without any demand for exact opening pressure, the valve may be
tted with the spring housing in other positions. When the valve is mounted, it is important to avoid the inuence
of static, dynamic and thermal stress.

A very precise technique has been applied for the production of the seal. However, this seal can still be damaged, if
dirt is blown from the pipe system into the valve.

Re-calibration/servicing

In certain countries the authorities demand that the valves are checked at least once a year (see local rules).

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