Danfoss 148R9515 DSV 1 And DSV 2 Double Stop Valve Installation Guide

Danfoss 148R9515 DSV 1 And DSV 2 Double Stop Valve

Specifications

• Product Name: Double stop valve DSV 1 & DSV 2
• Model Numbers: 148R9515, 148R9515
• Working Pressure: 40 bar g (580 psi g)
• Refrigerants Applicable: HCFC, HFC, R717 (Ammonia), R744 (CO2)

Product Usage Instructions

Installation

1. Ensure that the inlet/outlet pipe dimensions are not smaller than those of the safety valves.
2. Mount the double stop valve (DSV) and two safety valves (SFV) as indicated in the installation instructions.
3. Install the valve with the spindle in a horizontal position.
4. Open the valves by hand without using tools.
5. Clean the valve internally to remove welding debris before reassembly.
6. Avoid welding debris and dirt in the threads of the housing and bonnet.
7. Do not mount double-stop valves in systems where the outlet side is open to the atmosphere.

Maintenance

1. When performing service and maintenance, replace the complete packing gland only.
2. Do not remove the packing gland if there is internal pressure in the valve unless following precautionary measures.
3. To backseat the valve, turn the spindle counter-clockwise until it stops.
4. Pressure equalization may be required behind the packing gland before removal.

Assembly

1. Remove welding debris and dirt from pipes and valve bodies before assembly.
2. Check that the cone is fully screwed back towards the bonnet before placing it back in the valve body.

FAQ

Q: What refrigerants are applicable to the double-stop valve?

A: The valve is suitable for use with HCFC, HFC, R717 (Ammonia), and R744 (CO2) refrigerants. Flammable hydrocarbons are not recommended.

Q: What is the maximum working pressure of the valve?

A: The valves are designed for a maximum working pressure of 40 bar g (580 psi g).

Installation

Refrigerants

• Applicable to HCFC, HFC, R717(Ammonia), and R744 (CO2).
• Flammable hydrocarbons are not recommended. The valve is only recommended for use in closed circuits. For further information please contact Danfoss.

Temperature range

• DSV: –50/+100°C (–58/+212°F)

Pressure range

• DSV: The valves are designed for a max. working pressure of 40 bar g (580 psi g).

Installation

• Applied in connection with safety valves (SFVs) installation instructions for safety valves must be followed. The double stop valve (DSV) and the two safety valves (SFV) are to be mounted as indicated in fig. 10.

IMPORTANT:

• The inlet/outlet pipe dimensions must not be smaller than those of the safety valves.
• The valve must be installed with the spindle in a horizontal position (fig. 1). Valves should be opened by hand without the use of tools or other devices (fig. 3). The valve is designed to withstand high internal pressure.
• However, the piping system should be designed to avoid liquid traps and reduce the risk of hydraulic pressure caused by thermal expansion. It must be ensured that the valve is protected from pressure transients like liquid hammer in the system.

Recommended flow direction (fig. 2)

• To achieve optimum flow conditions, the valve should be installed with the flow as indicated by the arrow. Flow in the opposite direction is also acceptable, but slightly reduces the Kv- / Cv value.

Operating instructions

• When the spindle is turned clockwise the inlet socket C is connected to outlet B.
• When the spindle is turned anticlockwise the inlet socket C is connected to outlet A.

Welding

• If welding fittings are applied, these should be dismounted during the welding process. Welding directly on the valve housing, the bonnet should be removed (fig. 4) to prevent damage to the O-rings in the packing gland and between the valve body and bonnet, as well as the Teflon gasket in the valve seat. Only materials and welding methods, compatible with the valve housing material, must be welded to the valve housing.
• The valve should be cleaned internally to remove welding debris on completion of welding and before the valve is reassembled.
• Avoid welding debris and dirt in the threads of the housing and the bonnet.
• Removing the bonnet can be omitted provided that:
• The temperature in the area between the valve body and bonnet during welding does not exceed +150°C/+302°F.
• This temperature depends on the welding method as well as on any cooling of the valve body during the welding itself.
• (Cooling can be ensured by, for example, wrapping a wet cloth around the valve body.)
• Make sure that no dirt, welding debris, etc. gets into the valve during the welding procedure.
• Be careful not to damage the Teflon cone ring.
• The valve housing must be free from stresses (external loads) after installation.
• Double-stop valves must not be mounted in systems where the outlet side of the valve is open to the atmosphere.
• The outlet side of the valve must always be connected to safety valves, the system, or properly capped off, for example with a welded-on end plate.

Assembly

• Remove welding debris and any dirt from pipes and valve bodies before assembly.
• Check that the cone has been fully screwed back towards the bonnet before it is replaced in the valve body (fig. 5a).

Tightening

• Tighten the bonnet with a torque wrench, to the values indicated in the table (fig. 5b).

Colours and identification

• The DSV valves are painted with a red oxide primer in the factory. Precise identification of the valve is made via the ID ring at the top of the bonnet, as well as by the stamping on the valve body.
• The external surface of the valve housing must be protected against corrosion with a suitable protective coating after installation and assembly.
• Protection of the ID ring when repainting the valve is recommended.

Maintenance

Packing gland

• When performing service and maintenance, replace the complete packing gland only, which is available as a spare part. As a general rule, the packing gland must not be removed if there is internal pressure in the valve. However, if the following precautionary measures are taken, the packing gland can be removed with the valve still under pressure:

Backseating (fig. 6)

• To backseat the valve, turn the spindle counter-clockwise until it stops.

Pressure equalization (fig. 7)

• In some cases, pressure forms behind the packing gland. Hence a hand wheel or similar should be fastened on top of the spindle while the pressure is equalized.
• The pressure can be equalized by slowly screwing out the gland.
• Removal of packing gland (fig. 8)
• The packing gland can now be removed.
• Check that the spindle is free of scratches and impact marks.
• If the Teflon cone rings have been damaged, the whole cone assembly must be replaced.

Assembly

• Remove any dirt from the body before the valve is assembled. Check that the cone has been screwed back towards the bonnet before it is replaced in the valve body (fig. 5a). Also check that the O-rings are free of scratches and impact marks.

Tightening

• Tighten the bonnet with a torque wrench, to the values indicated in the table (fig. 5b).
• Tighten the packing gland with a torque wrench, to the values indicated in the table (fig. 9).
• Use only original Danfoss parts, including packing glands, O-rings, and gaskets for replacement. Materials of new parts are certified for the relevant refrigerant.
• In cases of doubt, please contact Danfoss.
• Danfoss can accept no responsibility for possible errors in catalogs, brochures, and other printed material. Danfoss reserves the right to alter its products without notice.
• This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed.
• All trademarks in this material are property of the respective trademarks of Danfoss A/S. All rights reserved.
• DKRCI.PI.IE0.A3.52 / 520H1538 © Danfoss A/S (AC-MCI/MWA), 2013-11

Documents / Resources

| Danfoss 148R9515 DSV 1 And DSV 2 Double Stop Valve [pdf] Installation Guide
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