Danfoss Shut-off valves Installation guide

Installation guide

Shut-off valves

Compressor Stop valve 50-100, 65 bar (942 psi)

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	1			2		3
				Max. Nm		Max. LB-feet
					Max. Nm	Max. LB eet
				NmNmmáx.		lblb--ftftmáx..
				Nm		MaxMax..LbLb-piedii di
				Maks. (		LB
				Maks. (Nm)		LB-
					.	Maks. (lbf x ft)
					Макс.	Maks. (lbf x ft)
						.
				момент		Макс.момент
				,		,
				затяжки, Нм		затяжки,
					Nm Máx.	/
				Nm Máx.		LBфунт/фут-pés Máx.
						LB-pés Máx.
				DN 50	44	32
				DN 65	74	54
				DN 80	44	32
				DN 100	75	53
	4a		4b
	MaintenanceMaint		//Wartungartung / /EntretienEntretien/ Mantenimiento/ Mantenimiento/ Manutenzione/ Manutenzione/			// Serwis/ Serwis/ / Техническое обслуживание/ Manutenção/ Manutenção
	5		6		7	8
				Max. Nmm	Max. LBB--fefeett
				Nm máxx. .	lblb-ftmáxáx. .
				Nm	-piedi
					Max. Lb-piedi
				Maks (Nm)	B-
				Maks. (Nm)	LB-
				.	Maks. (lbf x ft)
			D	Макс.	Maks. (lbf x ft)
					.
				момент,	Макс.момент,
				затяжки,Nm MáxНм.	затяжки,/
				Nm Máx.	LBфунт/фут-pés Máx.
					LB-pés Máx.
			DN 50-65
			DN 80-100	1 0
	9		10
	© Danfoss | DCS (ms) | 2020.12					AN362424309224en-000101 | 1

ENGLISH

Installation

Refrigerants

R717 (Ammonia).

The valve is only recommended for use in closed circuits. For further information please contact Danfoss.

Pressure and temperature range

65 bar (942 psi)

-10 °C – +190 °C (14 °F – +374 °F).

Installation

The valve must be installed with the spindle vertically upwards or in horizontal position (fig. 1). The valve is designed to withstand a 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.

Attention!

Compressor Stop valves are shut-off valves and must always be either fully closed or fully open. Half open positions are not allowed.

Recommended flow direction

To achieve optimum flow conditions, the valve should be installed with the flow towards the valve cone as indicated by the arrow on the side of the valve body

(fig. 2). Flow in the opposite direction is also acceptable (fig. 2), but slightly reduces the kv- / Cv value.

Welding

The bonnet should be removed before welding (fig. 3) to prevent damage to the sealing parts in the packing gland and between the valve body and bonnet, as well as the peak gasket in the valve seat. Only materials and welding methods, compatible with the valve housing material, must be used. 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 +190 °C/+374 °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. get into the valve during the welding procedure.

Be careful not to damage the peak cone ring.

The valve housing must be free from stresses (external loads) after installation.

Stop valves must not be mounted in systems where the outlet side of the valve is open to atmosphere. The outlet side of the valve must always be connected to 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 body before assembly. Check that the cone has been fully screwed back towards the bonnet before it is reinstalled in the valve body (fig. 4a).

Tightening

Tighten the bonnet with a torque wrench, to the values indicated in the table

(fig. 4b).

Please note that the table (fig. 4b) containing maximum torque must be adhered to and never exceeded.

Corrosion protection and identification

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. 5)

To backseat the valve, turn the spindle counter-clockwise until the valve is fully open.

Pressure equalization (fig. 6)

In some cases, pressure forms behind the packing gland. Hence a handwheel 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. 7)

The packing gland can now be removed.

Fitting a replacement packing gland (Fig. 8)

Great care should be taken when fitting a new packing gland and damage to Teflon gaskets must be avoided.

During fitting, the individual components in the packing gland should be placed in order and positioned as shown (Fig. 8).

Dismantling the valve (fig. 9)

Do not remove the bonnet while the valve is still under pressure.

Check that the flat gasket (pos. A) has not been damaged.

Check that the spindle is free of scratches and impact marks.

If the reinforced peak ring has been damaged, the whole cone assembly must be replaced.

Replacement of the cone (fig. 9)

Unscrew the cone screw (pos. B) with an Allen key.

Compressor Stop valve 50-65 .....	2.5 mm A/F
Compressor Stop valve 80-100 ......	4 mm A/F

(An Allen key is included in the Danfoss Industrial Refrigeration gasket set).

To remove the balls compress the disk spring (pos. D) and remove the balls (pos. C).

Number of balls in pos. C:
Compressor Stop valve 50-65 ..............	14 pcs.
Compressor Stop valve 80-100 ..........	13 pcs.

The cone can then be removed. Place the new cone on the spindle and remember to place the disk spring (pos. D) between the spindle and the cone. Compress the the disk spring and replace the balls (pos. C). Reinstall the cone screw using Loctite No. 648. to ensure that the screw is properly fastened.

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. 4a).

Tightening

Tighten the bonnet with a torque wrench, to the values indicated in the table (fig. 4b). Please note that the table (fig. 4b) containing maximum torque must be adhered to and never exceeded.

Tighten the packing gland with a torque wrench, to the values indicated in the table (fig. 10).

© Danfoss | DCS (ms | 2020.12

AN362424309224en-000101 | 2