Ammonia Valves | Applications of Ammonia and Operating Conditions
Ammonia valves play a crucial role in regulating the refrigerant within refrigeration systems. To ensure optimal system performance, it is essential to use ammonia valves that are specifically designed for their intended applications and operating conditions. There are various types of ammonia valves, each with unique features and applications in ammonia-based systems. Before exploring these types, let’s examine the properties of ammonia as a refrigerant.
Ammonia (NH3), designated as refrigerant R-717, is a colorless gas composed of nitrogen and hydrogen. It is lighter than air and possesses a strong, pungent odor. Ammonia is known for being toxic, flammable, and corrosive, making its handling and storage highly sensitive. As a result, managing ammonia in refrigeration systems and storage tanks requires the use of standardized valves and advanced control devices to ensure safety and efficiency.
Under atmospheric pressure, ammonia has a boiling point of -33.3°C. Due to this low boiling point, keeping ammonia in its liquid state necessitates high pressure (approximately 300 psi) or low temperatures (around -30°C). In industrial applications, ammonia is commonly stored and transported in specialized cylinders or storage tanks mounted on dedicated gas transport vehicles.
By selecting the right ammonia valves and maintaining proper operational conditions, businesses can enhance system efficiency, reduce risks, and ensure compliance with safety standards.
Danfoss Ammonia Valves and Controls
Danfoss Engineering Company was founded in 1933 in Nordborg, Denmark. Today, it employs over 40,000 specialists, operates 95 factories across more than 20 countries, and has a presence in over 100 countries. To ensure the accurate and reliable regulation of ammonia, the use of standardized ammonia valves and controls is essential. Below, we introduce the different types of Danfoss ammonia valves and their applications in refrigeration systems.
Danfoss SVA Stop Valve
The Danfoss SVA stop valve is available in both angle (90-degree) and straight (linear) configurations, designed to meet all refrigeration system requirements. These valves provide maximum flow capacity and can be easily reopened and serviced when needed. Their conical design ensures complete closure, ensuring reliable operation and safety.
Danfoss Manual Ammonia Valve Models:
SVA-S 10, SVA-S 15, SVA-S 20, SVA-S 25, SVA-S 32, SVA-S 40, SVA-S 50, SVA-S 65, SVA-S 80, SVA-S 100, SVA-S 125
Danfoss Stop Valve Features:
- Available in various sizes
- Compatible with all refrigerants, including ammonia and Freon
- Offered in handwheel models for frequent use and capped models for infrequent operation
- Available in straightway and angleway (90-degree) configurations
- Sealable with a wire to prevent unauthorized access
- Allows flow in both directions
- Constructed with stainless steel bolts and nuts
- Operating pressure up to 40 bar (580 psi)
- Welded connections only
Danfoss Ammonia Stop Valve Models:
SVA-S 10, SVA-S 15, SVA-S 20, SVA-S 25, SVA-S 32, SVA-S 40, SVA-S 50, SVA-S 65, SVA-S 80, SVA-S 100, SVA-S 125
Danfoss NRVA Check Valve
The Danfoss NRVA check valve is designed for a wide range of applications, including HVAC as well as commercial and industrial refrigeration systems. These valves are suitable for installation in liquid, suction, and hot gas lines in refrigeration and air conditioning systems using ammonia and Freon refrigerants.
Key Features:
- Available in various sizes
- Ensures proper flow direction
- Steel valve housing for durability
- Operating pressure up to 40 bar (580 psi)
- Flanged connection for secure installation
- Equipped with a damping piston, enabling installation in vibrating lines, such as compressor discharge lines
Danfoss Ammonia Check Valve Models:
NRVA 15, NRVA 20, NRVA 25, NRVA 32, NRVA 40, NRVA 50, NRVA 65
Danfoss Electronic Controller
Danfoss electronic controllers provide a comprehensive solution for monitoring and optimizing refrigeration and air conditioning systems. They ensure precise control and efficient operation of the system components. Below, you can find the catalog downloads for the most important Danfoss controllers.
Danfoss Electronic Controller Models:
AKS 3000, AKS 33, AKS 38, AKS 2050, ICM 25, ICM 32, ICM 40, ICM 50, ICAD 600, ICAD 900, ICAD 1200, UPS-ICAD, AKS 41-00 (1500mm), AKS 41-00 (1700mm), AKS 41-00 (5m), EKC 331, EKC 347, EKE 347, EKC 366, EKC 361
Danfoss SCA Stop-Check Valve
The Danfoss SCA stop-check valve serves a dual purpose, functioning both as a check valve and a shut-off valve, allowing complete closure of the flow path. This series is available exclusively in an angle (90-degree) design. These valves are designed to open at very low differential pressures, ensuring optimal flow conditions. Additionally, they are easy to open for inspection and servicing.
Danfoss Ammonia Stop-Check Valve Models:
SCA 15, SCA 20, SCA 25, SCA 32, SCA 40, SCA 50, SCA 65, SCA 80, SCA 100, SCA 125
Danfoss LLG Sight Glass
The LLG sight glasses are constructed from ductile steel and adhere to the highest industrial and marine refrigeration standards. They are available in three models: LLG 185, LLG 335, and LLG 740. Featuring specially hardened glass, the Danfoss LLG sight glass enables quick and easy visual inspection of the liquid level.
Features of the Danfoss Sight Glass:
- Available in various sizes
- Compatible with all refrigerants, including ammonia and Freon
- Operating temperature ranges: +100°C/-10°C or +30°C/-50°C
- Working pressure of 25 bar (375 psi)
Danfoss Ammonia Sight Glass Models:
LLG 185 – LLG 335 – LLG 335 S – LLG 590 S – LLG 740 S – LLG 995 S – LLG 1145 S – LLG 1550 S
Danfoss REG Regulating Valve
The REG is an ammonia regulating valve that, when fully closed, operates as a standard manually closed valve. These valves are available in both angle and straight configurations.
Features of the Danfoss Regulating Valve:
- Available in various sizes
- Suitable for all refrigerants, including ammonia and Freon
- Easy to open for inspection and servicing
- Working pressure of 40 bar (580 psi)
- Operating temperature range of -50°C to +150°C
- Housing and bolts made of low-temperature steel
Danfoss Ammonia Regulating Valve Models:
REG 10 – REG 15 – REG 20 – REG 25 – REG 32 – REG 40 – REG 50 – REG 65
Danfoss Safety Valve
The Danfoss safety valve, available in an angle design, is specifically engineered to protect tanks and other equipment from overpressure. It is built to meet the safety and quality requirements established by international standards.
Danfoss Safety Valve Models:
SFA 15 – SFV 20 – SFV 25 – DSV 1 – DSV 2 – BSV 8
Danfoss EVRA Solenoid Valve
The Danfoss EVRA ammonia solenoid valve is a direct-acting shut-off valve that operates with a coil. This solenoid valve is ideal for ammonia and Freon liquid lines, suction lines, and hot gas lines. The EVRA solenoid valve is available as a complete assembly or as separate components. The valve body, electrical coil, and flanges can all be ordered individually.
Features of the Danfoss Solenoid Valve:
- Suitable for all refrigerants, including ammonia and Freon
- Operating temperature range: -40°C to +130°C
Danfoss Ammonia Solenoid Valve Models:
EVRA 3 – EVRA 10 – EVRA 15 – EVRA 20 – EVRA 25 – EVRA 32 – EVRA 40 – EVRAT 10 – EVRAT 15 – EVRAT 20
Danfoss FIA, FA Strainer
The Danfoss FIA ammonia strainer is available in both angle and straight configurations. These strainers are designed to efficiently filter and allow smooth flow. Installation, inspection, and cleaning of the filter are simple and straightforward. They are used before automatic controls, solenoid valves, pumps, compressors, and other equipment. The strainer performs filtering during the initial startup and in applications requiring continuous refrigerant filtration. It helps reduce the risk of system failures and minimizes equipment wear.
FA strainers are produced in a straight configuration and come in two sizes (15 mm and 20 mm). They can be coupled with solenoid valves using flanges
Features of the Danfoss Strainer Filter:
- Suitable for all refrigerants, including ammonia, Freon, CO2, and other flammable gases
- Available in various sizes
- Allows replacement of the top cover, converting the valve into other Flexline valves
- Quick and easy valve servicing without welding required
- Strainer mesh made of stainless steel
- Operating temperature range: -60°C to +150°C
- Working pressure: 52 bar (750 psi)
Danfoss Ammonia Strainer Valve Models:
FA 15 – FA 20 – FIA 15 – FIA 20 – FIA 25 – FIA 32 – FIA 40 – FIA 50 – FIA 65 – FIA 80 – FIA 100 – FIA 150
Danfoss RT, ERC, EKC Pressure Switch and Thermostat
Danfoss RT ammonia pressure switches feature a single blade that opens or closes based on the input pressure at the switch connection and the control’s set value. The RT series includes pressure switches, differential pressure switches, and pressure switches with an adjustable neutral zone. These products are suitable for use in both industrial and marine refrigeration applications.
Features of Danfoss Pressure Switches and Thermostats:
- Simple design
- High accuracy
- Excellent repeatability
- Long operational life
- Available in various types to cover different pressure and temperature ranges
Danfoss Ammonia Switch Models: RT 1 A – RT 5 A – RT 1 A (R) – RT 5 A (R) – RT 1 AL – RT 5 AL – RT 260 A – RT 262 A – RT 260 AL – MP 55 A – EKC 102 A – ERC 101 – ERC 211 – ERC 214 – sensor EKS211 – RT 101
Danfoss SV Float Valve
The Danfoss SV float valve is used on the low-pressure side of ammonia systems to regulate the liquid level in refrigeration, freezing, and air conditioning systems.
Features of Danfoss Float Valve:
- Reliable operation
- Stable adjustment even with sudden changes in cooling load
- Capability to inject ammonia liquid into the housing or directly into the evaporator via an external connection pipe
- Needle and filter replacement possible without emptying the housing
Danfoss Ammonia Float Valve Models:
SV 1 – SV 3 – SV 4 – SV 5 – SV 6
Danfoss KP Pressure Switch
Danfoss KP ammonia pressure switches are used in refrigeration and air conditioning systems to protect against very low suction pressures and very high discharge pressures. They also control the on/off operation of compressors and air-cooled condenser fans.
Danfoss KP Ammonia Pressure Switch Models:
KP 1A – KP 5A – KP 15A – KP 81 – KP 79 – KP 98 – KP 77
Danfoss QDV Quick Drain Valve
The QDV is an on/off valve designed for draining oil from pressurized ammonia systems. The QDV oil drain valve immediately shuts off the flow when the handle is released, preventing unnecessary ammonia leakage. This valve not only protects technical personnel but also helps prevent the release of ammonia odors into the environment.
Features of the Danfoss QDV Oil Drain Valve:
- Compatible with ammonia refrigerants
- 360-degree handle rotation
- Available with a manual valve for quicker on-site installation
- Working pressure: 40 bar (580 psi)
- Operating temperature range: -50°C to +150°C
Danfoss Ammonia Oil Drain Valve Models:
QDV 15 – QDV 15 + SVA 15
Danfoss OFV Pressure Regulating Valve
The OFV valve features an angle design with an adjustable opening pressure. The pressure can be set between 2 and 8 bar, allowing the valve to open once the desired pressure is reached. It can also be manually closed when the system is off or undergoing maintenance. Specifically designed to prevent vibrations caused by low velocity or density, the OFV valve is ideal for refrigeration applications with large fluctuations.
Features of the Danfoss OFV Pressure Regulating Valve:
- Compatible with ammonia refrigerants
- 360-degree handle rotation
- Available with a manual valve for quicker on-site installation
- Working pressure: 40 bar (580 psi)
- Operating temperature range: -50°C to +150°C
Danfoss Ammonia Pressure Regulating Valve Models:
OFV 20 – OFV 25
Danfoss ICS, PM Pilot Operated Main Valve
The ICS main valve consists of three key components:
- Valve body
- Operating module
- Top cover
The Danfoss ICS main valve is used to regulate pressure, temperature, and the starting/stopping of refrigeration systems. ICS main valves (formerly known as PM in older models) can be used in both high-pressure and low-pressure areas, in dry and wet suction lines, and in liquid lines without phase change. The function of an ICS valve depends on the pressure pilots installed on the pilot valve or externally. The ICS 1 features one pilot pressure connection, while the ICS 3 has three pilot pressure connections.
Features of the Danfoss ICS Main Valve:
- Compatible with ammonia, CO2, and Freon refrigerants
- Designed for industrial refrigeration applications
- Low-temperature steel body construction
- Lightweight and compact design
- Working pressure: 52 bar (754 psi)
- Operating temperature range: -50°C to +150°C
Danfoss Ammonia Pressure Regulating Valve Models:
ICS 1-15 – ICS 1-25 – ICS 1-32 – ICS 1-40 – ICS 1-50 – ICS 1-65 – ICS 3-15 – ICS 3-20 – ICS 3-25 – ICS 3-32 – ICS 3-40 – ICS 3-50 – ICS 3-65 – ICS 3-80 – ICS 3-100 – ICS 3-125 – ICS 3-150 – ICF 20-4-9 – ICS 20-4-11 – PM1 15 – PM1 20 – PM1 25 – PM1 50 – PM1 65 – PM3 15 – PM3 20 – PM3 25 – PM3 32 – PM3 40 – PM3 50 – PM3 65 – PM3 80 – PM3 100 – PM3 125
Danfoss CVP, CVPP, CVC, CVH, CVE, EVM Pilot Valve
The ammonia pilot valve is installed directly on the main valve to control it. For smaller capacities, the pilot valve can function independently without a main valve and can be mounted on a CVH housing.
Danfoss offers a wide range of pilot valves with the following models:
- CVP Model: Constant pressure pilot valve
- CVPP Model: Differential pressure pilot valve
- CVC Model: Differential pressure pilot valve with reference pressure port
- CVE Model: Electronic constant pressure pilot valve
- EVM(NC) Model: Normally closed solenoid pilot valve
- EVM(NO) Model: Normally open solenoid pilot valve
- CVH Model: Housing for external pilot valve installation on lines
Features of the Danfoss ICS Pilot Valve:
- Compatible with ammonia, CO2, and Freon refrigerants
- Provides extremely precise control of pressure and temperature
- Allows pilot valves to be mounted directly onto the main valve without welding or separate pilot lines
- All pilot valves can be used on main valves of all sizes
- Multiple pilot valves can be installed in series or parallel to achieve multiple functions with a single ICS main valve
- Equipped with a special gasket
Services of Broudat Kar Atlas Company
With nearly 40 years of distinguished experience in the refrigeration industry, Atlas Refrigeration Co. is a trusted supplier of Danfoss ammonia valves. Our experts are ready to provide guidance on selecting the most suitable valves for your needs, ensuring cost-effective ammonia installations.
All parts supplied by our company come with a guarantee of authenticity.
For a free consultation, feel free to contact us. We’re here to assist you with all your refrigeration needs!
Final Note
In this article, we introduced ammonia refrigerants and the ammonia valves essential for the refrigeration industry. We highlighted the Danfoss ammonia valves and controls, detailing their models, features, and applications. Catalogs for all products are available for download.
Additionally, we provided a price list for Danfoss ammonia valves and controls. For inquiries regarding the purchase of Danfoss ammonia products from Denmark, with guaranteed authenticity and competitive pricing, please don’t hesitate to contact us. We’re here to assist with your needs!
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