Ammonia Valves controls ...
   
  Ammonia - the refrigerant of choice
 

The use of ammonia for cooling applications dates back to the mid 1800's. By the early 1900's the use of ammonia as a refrigerant was largely perfected in a closed cycle of evaporation, compression and condensation. Since then, the entire food distribution chain has come to depend on the thermodynamic properties of this crucial refrigerant.
Today, ammonia remains the refrigerant of choice for industrial cooling applications. The preeminent authority on industrial refrigeration, the advantages of ammonia over various types of freon are numerous.

 

Ammonia costs less. Not only is ammonia significantly cheaper than the least expensive halocarbons, but because the density of ammonia is half that of halocarbons, only half as much material needs to be purchased to charge a system.

 

Ammonia is more efficient. Its mass flow rate for a given refrigerating capacity is 1/7 that of HCFC-22, meaning only one 1/7 the liquid needs to be pumped for a given refrigerating capacity. Consequently, the mechanical pump and pumping power will be less in an ammonia system.

 

Ammonia requires smaller vapor line pipe sizes for large systems spread over a large area due to less drop in saturation temperature compared to halocarbons.

 

Ammonia systems are more tolerant of water contamination than freon systems. However, this is only a relative advantage for small amounts of water contamination, as concentrations greater than 100 ppm create problems in ammonia systems.

 

Ammonia has more favorable heat-transfer coefficients than halocarbons. Compared to HCFC-22, ammonia has the following advantages: a. specific heat of liquid to vapor = 4:1 b.latent heat of vaporization = 6:1 c.liquid thermal conductivity = 5.5:1 d.viscosities = .8:1 e.liquid density = .5:1

   
   
 
  Solenoid Valves for Ammonia
   


 
Manual / Wiring Diagram
 

Application

These valves are for Ammonia duty. The MSVA are pilot operated valves whilst the MDSVA are direct operated solenoid valves.
They are used in many applications such as cold stores, freezers, chilling applications etc.

 
Installation

These valves must be installed in horizontal positions with the coil housing no more than 45 degrees from the vertical position.

     
Construction

The valve is made up from various metals. Whilst stainless steel is used for components like stems, plungers, the main body is made from CI/WCB.

     
 
 
Type Flanged
Connection
Port Size
inches

MOPD
PSI

Nominal Liquid Capacity T.R.-
Ammonia Pressure Drop P.S.I.

Coil Rating

AC 1 2 3 4 5 Type Volt-Hz Watts
MDSVA 12 1/2" 0.140 250 8.0 11.2 13.5 16 17.5 SVC-1 230 AC
50/60
18
MSVA 12 1/2" 0.450 275 68 91 110 131 143
MSVA 12 3/4" 0.600 275 75 97 122 145 167
MSVA 25 1" 0.950 300 119 169 221 241 266 SVC-2
MSVA 25 1.1/4" 1.075 300 125 174 225 249 277
MSVA 40 1.1/2" 1.260 300 275 390 500 500 625
   
   
  STRAINERS
 


 
Manual / Wiring Diagram
 

Application

These strainers are specially designed to be installed in conjunction with solenoid valves.
Their mesh is selected so that no particles enter and disrupt the operation of the solenoid valve. For smooth operation of solenoid valves these strainers are mandatory.

 
Installation

For best results, the strainer is installed right at the inlet of the solenoid valve or as close to it as possible for larger sizes.

 
Features

retains contaminants e.g. Slag, weld beads, pipe fittings.
pressure drop insignificant

 

Construction

The material of construction for the body is CI whist for the mesh it is stainless steel.

     
   
Model DIMENSIONS (MM) Weight
A B Kg
CAS12 68 122 1.3
CAS20 85 140 2.3
 
Model

DIMENSIONS (MM)

Weight
A B C D E F G H PCD BOLT SIZE Kg
CAS25 190 136 42 150 - 47 58.8 4 80 M12x40 7
CAS32 190 154 42 150 - 47 58.8 4 80 M12x40 7
 
   
  Liquid Level Controller
 


 
 Manual / Wiring Diagram
 

Application

While primarily designed for Ammonia, this control is also suitable for R-22 and other non-corrosive liquids that have a specific gravity of 0.5 or more.
The controller is ideal for the control of the operating level of liquid in liquid refrigerant accumulators and separators. Although this is normally done with a solenoid valve, the controller can activate an alarm or a pump or similar device.

 
Construction

Mechanical Float:
Light deep drawn body, drawn in one piece. Ball & Stem are made from SS. Electronic control box made from ABS in an international size 96X96 housing.
This device consists of two separate units, the float chamber and the electronic controller. The float chamber consists of a housing, float ball, float coil and coil enclosure. The float ball is located inside the housing and moves an attached magnetic stem up or down in an enclosing tube from the top and is protected by the coil enclosure. The construction permits all high voltage connections and wiring to be made at a remote or non-hazardous location.
Gravity equalisation of the liquid level lin the float chamber is a function of the liquid. For fluids having a high viscosity the response time will be slower. The level controller should not be used on water applications.

     
   
 
  Liquid Level Switch
 


 
Manual / Wiring Diagram
 

Application

While primarily designed for Ammonia, this control is also suitable for R-22 and other non-corrosive liquids that have a specific gravity of 0.5 or more.
The controller is ideal for the control of the operating level of liquid in liquid refrigerant accumulators and separators. Although this is normally done with a solenoid valve, the controller can activate an alarm or a pump or similar device.

 
Construction

Mechanical Float:
Light deep drawn body, drawn in one piece. Ball & Stem are made from SS. Electronic control box made from ABS in an international size 96X96 housing.
This device consists of one float chamber with a magnetic operated switch in the top housing.The float chamber consists of a housing, float ball and micro switch. The float ball is located inside the housing and moves an attached magnetic stem up or down in an enclosing tube from the top and is protected by the enclosure.
Gravity equalisation of the liquid level lin the float chamber is a function of the liquid. For fluids having a high viscosity the response time will be slower. The level controller should not be used on water applications.

     
 
  Butt Weld Shut Off Valves
 


 
Manual / Wiring Diagram

Application

These valves are used in Ammonia as well as Freon systems.

 
Construction

Primary body construction is from LCB and can work till low temperatures.

 

 
     
     
     
   
BUTT WELD ANGLE VALVE SOCKET WELD ANGLE VALVE
Size
(mm)
Size
(in)
H
(mm)
B
(mm)
G
(mm)
Wt
(kg)
Connection
(OD)
Size
(mm)
Size
(in)
H
(mm)
B
(mm)
G
(mm)
Wt
(kg)
Connection
(ID+020)
15 1/2" 172 79 45 0.800 21.8 15 1/2" 172 79 45 0.800 22.0
20 3/4" 178 79 45 0.800 27 20 3/4" 178 79 45 0.850 27.5
25 1" 183 79 45 0.980 33.7 25 1" 183 79 45 1.100 34.5
32 1.1/4" 231 100 55 2.000 42.5 32 1.1/4" 231 100 55 2.200 43.0
40 1.1/2" 235 100 55 2.400 48.3 40 1.1/2" 235 100 55 2.400 49.0
50 2" 245 115 60 3.400 60.3 50 2" 245 115 60 3.600 61.0
65 2.1/2" 283 125 70 5.000 76 65 2.1/2" 283 125 70 5.250 76.8
80 3" 334 181 90 8.300 88.9 80 3" 334 181 90 9350 90.0
100 4" 379 97 106 14.200 114.3 100 4" 379 97 106 14.800 115.5
 
 


 
Manual / Wiring Diagram
 

Socket Weld Shut off Valve
     
   
BUTT WELD STRAIGHT VALVE SOCKET WELD STRAIGHT VALVE
Size
(mm)
Size
(in)
H
(mm)
B
(mm)
G
(mm)
Wt
(kg)
Connection
(OD)
Size
(mm)
Size
(in)
H
(mm)
B
(mm)
G
(mm)
Wt
(kg)
Connection
(ID+020)
15 1/2" 139 163 120 0.860 21.8 15 1/2" 141 163 120 0.950 22.0
20 3/4" 145 164 120 0.860 27 20 3/4" 149 164 120 0.950 27.5
25 1" 156 172 120 1.100 33.7 25 1" 160 172 120 1.200 34.5
32 1.1/4" 197 218 145 2.200 42.5 32 1.1/4" 202 218 145 2.300 43.0
40 1.1/2" 205 218 145 2.550 48.3 40 1.1/2" 210 218 145 2.650 49.0
50 2" 232 236 148 3.700 60.3 50 2" 238 236 148 3.900 61.0
65 2.1/2" 264 266 176 6.000 76 65 2.1/2" 271 266 176 6.350 76.8
80 3" 332 331 216 10.100 88.9 80 3" 338 331 216 10.500 90.0
100 4" 381 370 264 17.200 114.3 100 4" 385 370 264 17.950 115.5