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Enerpred

Hydraulic Bolt Tensioners

Designed for screwing and unscrewing nuts with calibrated capacity in heavy duty fasteners when performing installation and dismantling and repair work in all industry branches. 


The work of the bolt tensioner is based on pre-stretching of a stud (bolt) with a capacity equal to the required capacity of screw connection fastening and the subsequent tightening of nuts without the application of capacity against stop into the support surface.


Bolt tensioner can be grouped and powered by a single pressure source through multi-way valves, which is the essential solution when you need to produce a synchronized tightening of the large number of bolted joints. 

Complete with removable holders and adapters according to the operating range.

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Key characteristics:
Серия: ДТГ...
Усилие: от 9 до 615 тс
Давление: от 60 до 70 МПа
Номинальное давление: от 60 до 70 Мпа
Рабочий объем масла: от 10 до 1043 см3
Размер под ключ закручиваемых гаек: от 36 до 150 мм , и круглые гайки
Масса: от 2,5 до 49,1 кг
Models
Accessories
Model with your options
Drawing
Model Rated
force
ts
Rated
pressure
Bar
Working
oil
capacity
cm³
Size
of
a
turnkey
nut
range
mm
Thread
size
prestressing
rods
Weightkg Recommended
pump
DTG10-24 9 700 10 36 М24×1,5 2,5 NRG-7004
DTG20 20 700 29 41, 46, 50 М27×2, М30×2, М33×2 8,8 NRG-7004
DTG30 29 700 40 55, 60, 65 М36×3, М39×3, М42×3 12,6 NRG-7004
DTG80 81,7 700 149 65, 95 М42×3, М64×4 31 NRG-7004
DTG85M 87 700 122,5 65, 75 М42, М48 20 NRG-7004
DTG125G12-56х3 125 60 246 round nut М56×63 49,1 NRG-7004
DTG125 125,5 600 246,2 round nut М52×3 33 NRG-7004
DTG200 197 700 552,2 round nut М72×4 45,6 NRG-7010
DTG600M 615 600 1043 150 М100×6 251 NRG-7020R
Rated
force
ts
Rated
pressure
Bar
Working
oil
capacity
cm³
Size
of
a
turnkey
nut
range
mm
9 700 10 36
20 700 29 41, 46, 50
29 700 40 55, 60, 65
81,7 700 149 65, 95
87 700 122,5 65, 75
125 60 246 round nut
125,5 600 246,2 round nut
197 700 552,2 round nut
615 600 1043 150
Thread
size
prestressing
rods
Weightkg Recommended
pump
М24×1,5 2,5 NRG-7004
М27×2, М30×2, М33×2 8,8 NRG-7004
М36×3, М39×3, М42×3 12,6 NRG-7004
М42×3, М64×4 31 NRG-7004
М42, М48 20 NRG-7004
М56×63 49,1 NRG-7004
М52×3 33 NRG-7004
М72×4 45,6 NRG-7010
М100×6 251 NRG-7020R
Model DTG10-24 Rated
force
ts
9 Rated
pressure
Bar
700 Working
oil
capacity
cm³
10 Size
of
a
turnkey
nut
range
mm
36 Thread
size
prestressing
rods
М24×1,5 Weightkg 2,5 Recommended
pump
NRG-7004
Model DTG20 Rated
force
ts
20 Rated
pressure
Bar
700 Working
oil
capacity
cm³
29 Size
of
a
turnkey
nut
range
mm
41, 46, 50 Thread
size
prestressing
rods
М27×2, М30×2, М33×2 Weightkg 8,8 Recommended
pump
NRG-7004
Model DTG30 Rated
force
ts
29 Rated
pressure
Bar
700 Working
oil
capacity
cm³
40 Size
of
a
turnkey
nut
range
mm
55, 60, 65 Thread
size
prestressing
rods
М36×3, М39×3, М42×3 Weightkg 12,6 Recommended
pump
NRG-7004
Model DTG80 Rated
force
ts
81,7 Rated
pressure
Bar
700 Working
oil
capacity
cm³
149 Size
of
a
turnkey
nut
range
mm
65, 95 Thread
size
prestressing
rods
М42×3, М64×4 Weightkg 31 Recommended
pump
NRG-7004
Model DTG85M Rated
force
ts
87 Rated
pressure
Bar
700 Working
oil
capacity
cm³
122,5 Size
of
a
turnkey
nut
range
mm
65, 75 Thread
size
prestressing
rods
М42, М48 Weightkg 20 Recommended
pump
NRG-7004
Model DTG125G12-56х3 Rated
force
ts
125 Rated
pressure
Bar
60 Working
oil
capacity
cm³
246 Size
of
a
turnkey
nut
range
mm
round nut Thread
size
prestressing
rods
М56×63 Weightkg 49,1 Recommended
pump
NRG-7004
Model DTG125 Rated
force
ts
125,5 Rated
pressure
Bar
600 Working
oil
capacity
cm³
246,2 Size
of
a
turnkey
nut
range
mm
round nut Thread
size
prestressing
rods
М52×3 Weightkg 33 Recommended
pump
NRG-7004
Model DTG200 Rated
force
ts
197 Rated
pressure
Bar
700 Working
oil
capacity
cm³
552,2 Size
of
a
turnkey
nut
range
mm
round nut Thread
size
prestressing
rods
М72×4 Weightkg 45,6 Recommended
pump
NRG-7010
Model DTG600M Rated
force
ts
615 Rated
pressure
Bar
600 Working
oil
capacity
cm³
1043 Size
of
a
turnkey
nut
range
mm
150 Thread
size
prestressing
rods
М100×6 Weightkg 251 Recommended
pump
NRG-7020R

Advantages of Bolt tensioners:

  • Most conventional tools and devices that are used to tighten screw connections when working with long bolts (studs) can cause them to twist and thus complicate the problems for which they were created. These are the offset flange leaks, damaged seals that cause unplanned downtime for troubleshooting.
  • In all cases, when tightening screw connections requires maximum accuracy, reliability and dosed torque, the best option is to use a hydraulic bolt tensioner that solves all these problems.
  • Bolt tensioner range of use: flanged pipe joints, heat exchangers, pressure vessels, rolling mills, presses, motors, crushers, diesel engines, valves, turbines, compressors, and more.

Work principle:

  1. Nut is screwed by hand all the way into the supporting surface, and then the holder is setonthenut. Interchangeable adapter is screwed onto the exposed end of the stud. Length of adapter screwing with the stud must not be less than the diameter of the latter.

  2. Pressure is applied to the cavity of the cylinder, and creates a capacity through which the stud is pulled.

  3. Nut is screwed by hand all the way in without effort, and the pressure is released.

  4. The cylinder is removed.

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Сontact details
A.P. Valdaev Директор ООО "СТРОЙМОСТ"

Thank you for the timely delivery of hydraulic equipment (hydraulic cylinders, double-sided). Thanks to your efforts. Stroymost LLC has begun work on the span of the bridge span across the r. Sheksna on the highway of federal significance A-114 Vologda - Novaya Ladoga in terms established by the State contract.

We hope for further mutually beneficial cooperation.

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