IMI Hydronic Engineering DSV Safety Valves Instruction Manual

IMI Hydronic Engineering DSV Safety Valves

Product Overview

The staff must have the appropriate knowledge and must be competent.

Application

• Protection of the maximum pressure on heat generators
• Deployment in systems according to EN 12828, SWKI HE301-01
• Spring-loaded, can be vented manually
• sec guard version, 5-year warranty
• Vertical installation, arrow for flow direction to the top CE-component inspected:

DSV-H:

• Gun Metal
• Spring compartment protected by the diaphragm
• Addition of antifreeze agent up to 100 %

DSV-DGH:

• DSV 25 + 32: gun metal, DSV 40 + 50: nodular graphite iron GGG
• Spring compartment protected by expansion bellow
• Addition of antifreeze agent up to 100 %

Other applications than the ones described require the agreement of IMI Hydronic Engineering.

Observing the parameters, examine the conformity
Safety valves, including the supply and discharge lines, are to be planned carefully and individually for the specific system. We refer to our factory specifications and the applicable national regulations of the country of destination. The following is to be checked prior to the installation:

• Correspondence of component test mark on the upper part with the declaration of conformity.
• Correspondence of pick-up pressure PSV with planning specifications
  • last digit of the component test mark in the bar.
• Correspondence of SE with planning specifications
  • identification at the valve mouth.
• Maximum admissible protection temperature at the heat generator TAZ ≤ 120 °C.

Handling/Warranty

• The General Conditions of Sale and Delivery of IMI Hydronic Engineering shall apply.
• The warranty expires in the following cases:
  • Damage or removal of the factory leads seal.
  • Improper handling contrary to this installation and operating instructions.
• Improper handling may result in leakages, therefore:
  • The penetration of foreign matters into the valve is to be avoided during the installation and operation.
  • Careful handling with respect to storage, transport, and installation is to be ensured.
  • Be careful when treating with paint. Sliding parts must not come into contact with the paint.

Installation

Observe national regulations, such as DIN 4751 T2 or SWKI HE301-01. General notes:

Without Blow Tank

With Blow Tank

Blow tanks and dimensions for the supply and discharge according to national provisions.

• It is recommended to perform the installation at the highest point of the heat generator, with an expected discharge of vapor (e.g. direct heating) this is compulsory.
• To ensure easy accessibility, the component test mark must be readable.
• Any risk of freezing is excluded.
• Thoroughly rinse the system and supply line prior to the installation.
• No static and dynamic loads on the connections. Store supply and discharge lines separately and ensure the thermal compensation. Cross-section contractions are not allowed. The lines are to be installed with a gradient in such a manner that no water may accumulate. If required, separate drains are to be provided.
• The DNE supply line must at least correspond to the input cross-section SE of the safety valve. The pressure loss must not exceed 3 % of the pick-up pressure PSV. This is deemed to be met if the values according to page 5 are observed.
• The DNA discharge line must at least correspond to the output cross-section SA of the safety valve. The drainage is to be preferably performed by means of gradients in the flow direction. The installation of blow tanks may be required in some countries. It must be possible to observe the opening of the discharge line.

Dangerous spots, such as the opening of the blowout line and the drainage points, are to be identified with a hazard sign. The same applies to the relief well at the spring bonnet.

Operation/Maintenance

Check for mobility by means of carefully ventilating. Time intervals according to national regulations.

• DSV-DGH leaky: If the medium penetrates at the discharge, typically remedy by means of carefully ventilating. If this is not successful or the medium penetrates at the relief well of the spring bonnet, please contact customer service.
• DSV-H leaky: Typically, remedy by means of carefully ventilating. If this is not successful, then:

Shut off the system in such a manner that the safety valve is depressurized and the medium has cooled down. Turn the knurled nut to the left, the valve is released. Use the appropriate open-end wrench to screw the complete upper part out of the casing. Clean receiver and receiver seal using a cloth and brush, do not scrape! Screw on the upper part again and tighten carefully. Turn the knurled nut to the right until the stop. The valve works again at the set pressure.

Test

Safety valves are included in the equipment of pressure devices according to PED 2014/68/EU. Accordingly, they are tested in the factory. Depending on the country of the destination they may be subject to recurring inspection.

Read User Manual Online (PDF format)

Download This Manual (PDF format)

Download this manual  >>