Robinet Valves and Filters

 

Isolation Valves – VEK, VES

Robinet Frigorifique Francais (RFF) Refrigeration isolation valves can be supplied with a material certificate for body and bonnet which guarantees the impact strength at -50°C. The material test for the straight branch connections for the valves 300 and 450 mm is certified to –46°C.


 

RFF VES or VEK valves are constructed of low temperature carbon steel with stainless steel spindles and sealed by two O-rings with a special oil filled groove which provides a complete gas tight seal.

The PTFE seat provides positive shut-off with a minimum amount of force. All valves should be closed by turning the spindle clockwise. The O-rings can be replaced when the spindle is back-seated fully. Maintenance of the O-rings can be carried out without shutting down the plant.

By using valves fitted with caps on installations using odourless refrigerant, extra security is ensured. Gas refrigerant is contained under the cap which is manufactured with a small hole drilled under the gasket. When the cap is unscrewed, any build-up of refrigerant gas inside the cap will escape through this hole and can be heard as a whistling noise. This is an indication that the O-rings in the gland nut have been damaged or are in poor condition. All valves can be fitted with hand wheels or caps.

 

Regulation Valves

Hand-regulating valves are used for the regulation of refrigerant into the various evaporator circuits balancing the various parallel circuits around the system.

The hand-regulating valves can be supplied with a material certificate for body and bonnet which guarantees the impact strength at -50°C. The nominal pressure rating is 25 bar, with the possible higher pressure PN65 on request.

Valves are constructed of low temperature carbon steel with stainless steel spindles and sealed by two O-rings with a special oil filled groove which provides a complete gas tight seal. The O-rings can be replaced when the spindle is back-seated fully.

Maintenance of the O-rings can be carried out without shutting down the plant. The regulation of liquid flow is carried out by restricting the orifice size by the conical (cone) underneath the seat. The new model has a new PTFE seat which can be used to close the regulating valve completely.

Hand regulating valves can be identified by a series of two grooves machined into the vertical bonnet surface. They are painted mauve in colour. Hand-regulating valves have a normal maximum flow-rate which depends on their nominal diameters, but they can be fitted with special cones to give a higher-than-standard flow-rate.

 

Gauge Valves

The small 8 mm valves are intended for use with instruments and line gauge equipment. All valves are manufactured from low temperature steel with stainless steel spindles sealed by O-rings and designed in a special way which gives good gas tightness. Sealing is made by steel spindle on steel face (metal to metal).

The nominal pressure is 25 bar with higher pressure up to 65 bar available on request. These valves are also available in stainless steel.

As these valves have a simple design, they are not designed for back seating. The fluid enters under the spindle with the external equipment connected to the outlet. When the valve is closed isolating the external equipment it is possible to change the O-rings in the gland nut.

 

Ball Valves (actuated and manual operated) – model XVDS

  • Ball valves manufactured by RFF and supplied by Process Refrigeration have been designed for refrigeration installations using ammonia, CO2, CFC, HCFC, HFC or halocarbon refrigerants.
  • Temperature ranges from -50°C up to +150°C. Nominal pressure rating is 25 Bar although 40 Bar and 65 Bar valves are available for CO2 use.

  • RFF Ball valves are designed with full bore or reduced bore flow and have low pressure drop with high CV values.
  • The valve body which is subjected to system pressure, is manufactured from low temperature impact tested steel.
  • The simple three piece body design is easy to install without the need for special torque tools. Efficient insulation is possible with the use of extended valve heads on request.
  • The lower end of the valve spindle is sealed tight by a PTFE seat held in place by a compressed spring. This allows the replacement of the spindle O-ring while the plant is on line.
  • The top spindle seal incorporates the proven standard RFF design using two O-rings with lubricating, non freezing oil reservoir between them.
  • The Ball seat seal gas tightness is obtained by two special fibre glass reinforced PTFE rings.
  • The Ball valve can be supplied with a seal cap fitted with a rubber O-ring. There is an internal groove for venting gas to ensure safe removal at atmospheric pressure.
  • For installations with other refrigerants including ammonia, a lever is available for opening and closing.
  • If the valve needs to be automatically actuated, it can be supplied with an ISO flange. Then any ISO actuator can be fitted.
  • Pneumatic and electric actuators can also be supplied. These can be spring return actuators so that valves shut off automatically in case of power supply fault. Temperature : - 20°C / + 85°C(The pneumatic actuators use dry air where dew point is about 10°C less than minimum temperature - Air pressure : 5 to 10 bar)
 

Check Valves – CREK, CRES, CRDK, CRDS

RFF check valves are installed to prevent back flow of refrigerants. The body is welded into the pipe system and the moving portions of the valve are accessible by removal of a bolted cover.

The nominal pressure is 25 bar with temperature range from -50°C up to +150°C. Also available in PN65 or PN40 on request (depending on diameter).

The size of a check valve on an installation should be carefully selected especially if ammonia is used.

Check valves are supplied painted in blue to indicate the non-return function.

 

Stop / Check Valves ZVES

RFF stop/check valves can operate as both stop valves and check valves. When they are open, they act as check valves, but it is possible to lock them in the closed position, and they act as stop valves.

They are identical in design to standard versions of RFF valves. Maintenance and installation procedures are identical to the corresponding RFF standard valve.

The nominal pressure is 25 bar with temperature range from -50°C up to +150°C. Also available in PN65 or PN40 on request (depending on diameter).

The size of a stop/check valve on an installation should be carefully selected especially if ammonia is used. The stop/check valve should not be oversized or it may start to "chatter" when operating.

Stop/check valves are supplied painted in blue to indicate the non-return function.

 

Strainers – FREK, FRES, FRDK, FRDS

Our RFF filters in either inline or angle formats, have stainless steel mesh cartridges which can be removed for cleaning.

The normal pressure rating is 25 bar with a temperature range from -50°C up to +150°C. Filters are also available on request with higher pressure PN40 or PN65 (depending on diameter).

Maintenance and installation procedures are identical to the corresponding RFF valves. It is necessary to take care of the flow direction so that the filtration wire cloth is strengthened by the external wire cloth.

Filters are supplied painted grey whereas check valves are painted blue to indicate a non return function.

 

Stainless Steel Valves

There are a variety of stainless steel versions of the valves and filters mentioned above up to 25NB sizing. Contact us for more data.

 

CO2 Valves

There are CO2 versions of many valve and filter varieties of most sizes. Contact us for more data.