Hägglunds VFCCA 1000 Includes valves for ATEX environment

ln order to identify Hägglunds equipment exactly, the following ordering code is used. These ordering codes should be stated in full in all correspondence e.g. when ordering spare parts.

Explosion protection information, pilot valve, electrical operated

Pressure loss diagram

Pressure loss - A to Am, C to Cm
Viscosity 40 mm²/s

Pressure loss - Am - Cm, Cm to T
Viscosity 40 mm²/s

Calculation

Calculation for Exchange Oil Flow (Free Circulation)

When running in free circulation the motor pressure losses and valve losses appear as heat in the circuit. To maintain oil temperature within acceptable limits an exchange of oil may need to be made.

Example: Hägglunds CA 100 (Displacement 6.28 l/rev) running at 150 rpm.

This calculation demonstrates how to establish the Motor Flow.

Flow through the motor q = Vi ⋅ n

q = flow (l/min)

Vi = motor displacement (cm³⋅ 1000/rev)

n = speed (rpm)

Motor Flow q = 6.28 x 150 = 942 l/min

This calculation demonstrates how to establish the Total Pressure Drop.

dp = Pressure loss Am to Cm in the valve = 19.5 bar (from Pressure loss diagram)

dp1 = Pressure loss for the motor = 12.5 bar (see Data sheet for CA motor, section Pressure loss diagram)

Pressure Loss = 19.5 bar + 12.5 bar = 32 bar

This calculation demonstrates how to calculate the Power Loss.

To calculate the required flushing flow to keep the circuit temperature at a maximum ΔT of 15 °C warmer than the flushing oil.

q flushing = 2.3 x E l/min

Definition of E (Power):

Accumulated energy: W, W = m x c x ΔT

Accumulated energy per time unit: E (Power) E = W/t

The necessary flow to keep the circuit temperature at a maximum ΔT of 15 °C warmer than the flushing oil is:

q flushing = 2.3 x 50.2 = 115.46 l/min

Example

ΔT = 15 °C(example)

q = (1/(c x ρ x ΔT)) x E [l/min]

q = (60000/(2000 x 13050)) x E [W] [l/min]

q = 0.0023 x E [W] [l/min]

q = 2.3 x E [kW] [l/min]

Warning signs

In this manual you will find the following signs which indicate a potential hazard, which can or will cause personal injury or substantial property damage. Depending on the probability if the hazard, and how serious the injury or property damage could be, there are three levels if classification.

The signal words have the following meaning:

Warning sign, signal word	Meaning
	Indicates a dangerous situation which will cause death or severe personal injuries if not avoided.
	Indicates a dangerous situation which may cause death or severe personal injuries if not avoided.
	Indicates a dangerous situation which may cause minor or medium personal injuries if not avoided.
	Material damage: the product or its environment could be damaged.

General safety instructions

Danger from excessively high pressure! Danger to life or risk of injury, damage to equipment! Using the valve above the permissible maximum pressure can cause valve burst and hydraulic fluid to escape under high pressure. Use the valve within the permissible maximum pressure.
Pressurized valve Danger to life risk of injuries when working on valve in system not being depressurized. Protect the system against being energized. Make sure that the system is depressurized. Do not disconnect any line connection, ports and components when the system is pressurized.

Safety instructions for ATEX environment

Unsafe work on the valve Danger to life or risk of injury, damage to equipment! Before carrying any work on the valve, firstly make sure that a potentially explosive atmosphere cannot occur during the period of the work.

Escaping oil mist! Risk of explosion, fire health hazard, environmental pollution. Depressurize the system including valve and repair the leak. Keep open flames an ignition sources from the Hägglunds valve.
Static discharge Cleaning the valve with a dry rug may lead to explosions through electrostatic discharge that may cause severe injuries and even death. Do not use a dry rug for cleaning.
Lack of grounding Risk of explosion that may cause severe injuries and even death. The valve must always be fitted to the motor or via adapter fitted to the motor. The valve must be electrically conductive and equipotential bonded with the motor which must be grounded to the system. The valve are not allowed to be fitted to any separate bracket without grounding of the valve.
Painting Risk of explosion that may cause severe injuries and even death. The valve must not be painted or otherwise coated with non-conductive substances! Any change at the surface protection will lead to loss of explosion protection!