Progressive Bidirectional Lift Safety Gear, Cold Drawn and Oiled or Machined and Oiled Guide Rail Type - DYNATECH

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$189.28 - $301.67 / Unit | 1 Unit/Units (Min. Order)
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Quick Details
Place of Origin:
Brand Name:
Model Number:
PR-2500-UD V.35 and PR-2500-UD V.50
Upwards and Downwards
Guide rail type:
Cold Drawn or Machined and Oiled
Maximum P+Q:
3304 Kg
Minimum P+Q:
1107 Kg
Max. Trip Speed:
2,5 m/s
Minimum gripping width:
25 mm
ISO 9001 and Lifts Directive 2014/33/EU Annex VII
Supply Ability
Supply Ability:
2000 Unit/Units per Year
Packaging & Delivery
Packaging Details
Packaging/Shipment handled according to each countries regulations. Cardboard Box, Pallet Box and full container load available of several sizes

We specialize in the manufacture of safety components for lifts as suppliers of overspeed governors, instantaneous & progressive safety gears and other devices for elevator manufacturers and repair & maintenance companies.

Why buy Dynatech products?

Suppliers of lift safety components worldwide.
Adaptation to changes in regulations & new challenges. Dynatech is continuously investing on R&D+i.
Fidelity to customers. Offering them the result of our continuous effort to develop and extend our product range.
Elevator component specialist. Manufacturing progressive safety gears since 1996 and speed governors from 2001.
Team with engineering excellence. We can adapt our designs to the customer needs.
Youthful determination but with extensive experience in providing innovative solutions for the lift industry.

Product Description

Progressive Bidirectional Safety Gear 

PR-2500-UD V.35 and PR-2500-UD V.50

Visit our website to know more about our company:

Languages: Spanish, English, French or German and Chinese

Progressive Bidirectional Safety Gear PR-2500-UD V.35 and PR-2500-UD V.50

Minimum braking width
25 mm
Guide rail thickness (mm)
From 7 to 16 mm
Maximum tripping speed (m/s)
2,5 m/s
(P+Q) Maximum [kg] (+7.5%)
(P+Q) Minimum [kg] (-7,5%)

Find more information about the PR-2500-UD V.35 Operating and Maintenance Instructions at:


Find more information about the PR-2500-UD V.50 Operating and Maintenance Instructions at:


PR 2500 UD V.35 and PR 2500 UD V.50 Lift Directive 2014/33/EU  Standards: EN 81-20 and EN 81-50

PR 2500 UD V.35 and PR 2500 UD V.50 EAC

Company Information

History of Dynatech 1996 - Present

Dynatech, Dynamics & Technology, S.L.U. was founded in June 1996 when the company got the PR-2500 Single-Acting Progressive Safety Gear for lifts and elevators certification.  With this certification, Dynatech became the first fully independent Spanish Progressive Safety Gear manufacturer for elevators. The company began its activity at CEEI Aragón in Zaragoza (Spain) with its first product, the mentioned elevator component PR-2500.

From the very beginning, Dynatech have always placed great weight in development and innovation; being one of the first companies to gain quality certified progressive bi-directional mechanism for lift safety gear in accordance with European standard requirements. Moreover, they have developed important innovations in on-board elevator car overspeed governors as well as in standard installations with tension weights. 







Other products

Overspeed Governors

High & Low Speed

Onboard Overspeed Governors

High & Low Speed

Tensing Weight & Compact Tensing Weight

Mass or Spring Tensing Weight

Instantaneous Safety Gear

Progressive Bidirectional Safety Gears

Progressive with Lateral Displacement Safety Gear

BIdirectional & Unidirectional

Fixing kit for New or Existing Frames


What difference is there between the progressive safety gears ASG, PR and PQ?


The PR and PQ safety gears are fastened to the sling by means of 4 holes which restrict the possibility for sideways movement.

The ASG do not have 4 holes like the previous ones and are fastened to the sling by means of the T-25 driving bar. This allows them to move sideways, approaching the guide rail without any additional effort.


The fixing holes coincide between the PR and the PQ, which at the same time coincide with the fixing holes on the T-25 and T-25 UD driving bar.


The brake shoe on the PR and the PQ is completely fixed.

The brake shoe on the ASG is a floating system which allows it to adapt to the guide rail in a completely parallel way (the entire surface of the brake shoe will touch the guide rail although the safety gear has not been installed in a way that it is totally aligned). This system produces more efficient gripping and braking.


The ASG are supplied with the driving bar previously assembled, and in this way they are easier to install. The ASG-100, ASG-120, ASG-121 together with the T-25 driving bar and the ASG-100 UD, ASG-120 UD, ASG-121 UD together with the T-25 UD driving bar.

How often is it necessary to change the braking elements? In the usage manuals, it says that the safety gear braking elements must be changed after their third use.

The experience that we have gained in our test tower, where the laboratory carries out certification tests, is not useful to our customers given that our safety gears must brake 3 times with the same parts as well as with the decelerations according to the Regulation EN-81 Annex F. However, these tests are in free fall (for example if the cables break and the car falls rapidly).

The standard inspections (in downwards engagement) that our customers carry out on start-up are much less aggressive with the safety gears, since the counterweight helps the braking. Due to this, the braking elements such as the safety gears brake shoe will be in good condition after having braked various times (a lot more than 3) in periodic inspections.

As we do not know exactly how much time or how many inspections are necessary for the brake shoes to significantly wear out, it may be that they do not need to be changed ever in the life of the lift. We can only recommend a simple way to find out whether the brake shoes need to be changed (if the braking distance on the guide rail is double the distance than in the first tests, this means that the braking force has decreased and the brake shoes are probably too worn out). 

What does the word "regulacion" mean next to the P+Q on the EC type examination certificates? Is it possible for the customer to adjust the P+Q of a safety gear?

The word regulation on the certificates is related to the width of the spring (in our case made up of one or various steel plates) necessary to brake the maximum or minimum P+Q in the standardisation test. Do not pay too much attention to this value, because it varies a great deal according to the P+Q and is always adjusted here in our installations.

Any regulation carried out by the customer is absolutely forbidden.

What is the difference between PR-2500 UD V.35 and PR-2500 UD V.50?

 Both safety gears have the same certificate and the same standardisation name: PR-2500 UD. Both safety gears, therefore, have the same characteristics on their identification plate. The distances between the fixing holes are also the same. The distance between both is the distance between the guide rail and the friction elements and therefore the V.50 is longer than the V.35, given that on the V.50 the roller train has to travel a greater distance in order to operate. This is explained in more detail below:

V.35: The total distance between the guide rail and the friction elements is 3.5 mm (1.5 mm towards the brake shoe and 2 mm towards the rollers). This safety gear is used with the T2 driving bar.

V.50: The total distance between the guide rail and the friction elements is 5 mm (1.5 mm towards the brake shoe and 3.5 mm towards the rollers). As the distance from the roller train to the guide rail is greater, the total height of this safety gear is greater than on the V.35. The driving bar has to allow the rollers to move a greater distance, and for this reason the driving bar must be jointed (T3 Driving Bar).

The advantage of the V.50 is that it allows for a less accurate alignment of the guide rails than the V.35. On the V.35 if the car moves relatively with respect to the guide rail of 2 mm, the rollers may end up touching the guide rail and may begin braking in a way that is undesirable. On the V.50, the same movement should be 3.5 mm (2 mm more).

The only advantage of the V.35 is that it is cheaper, because it is smaller.