Nutberry Ltd - Manufacturers of Precision Single & Multiple Ply Bellows and High Temperature Gas Springs/ Thermo Dynamic Elements

Nutberry gas springs have an unparalleled reputation for reliablity and are the most technically advanced product available.

In September 1991, independent proof testing of Nutberry and their competitors' gas springs were undertaken by Flogates Limited. All the units were raised to 525°C (977°F) and then hot cycled. The results were:

Nutberry

Gas Springs

1000 Cycles

NO FAILURES

Best Competitor's

Gas Springs

460 Cycles

FAILED

One of the Nutberry gas springs was further cycled to destruction. The gas spring achieved a total of 1530 cycles.

Inorder to be able to achieve this level of reliability, Nutberry have developed their own multi-ply bellows for use in their gas springs.

Nutberry Gas Springs are the only gas springs with a guarantee.

Photograph of some gas springs

Temperature trial to compare force characteristics at elevated temperatures between Gas springs and Maraging springs

Note: the soak times were 30 minutes.

Average force with rise in temperature @ working length
	GAS SPRINGS		MARAGING SPRINGS
TEMP °C	TOTAL LOAD 4200	TOTAL LOAD 6300	TOTAL LOAD 4200	TOTAL LOAD 6300
-18	3.03 tons	3.86 tons	6.38 tons	8.13 tons
50	3.57 tons	4.60 tons	6.35 tons	8.09 tons
100	3.90 tons	5.00 tons	6.10 tons	7.76 tons
200	4.70 tons	6.00 tons	5.97 tons	7.60 tons
300	5.80 tons	7.40 tons	5.51 tons	7.01 tons
400	7.00 tons	8.86 tons	3.90 tons	4.96 tons
500	8.40 tons	10.56 tons	1.85 tons	2.35 tons
525	8.87 tons	11.30 tons	0.99 tons	1.27 tons

Minimum Permissible Force on 4200 Mech: 2.70 Tons.

Minimum Permissible Force on 6300 Mech: 3.43 Tons.

Why Choose Nutberry Gas Springs?

COST EFFECTIVE	Nutberry Gas Springs are guaranteed for 700 cycles, making them, per cycle, significantly cheaper than coil springs.
INCREASED REFACTORY PLATE LIFE	Users of Nutberry Gas Springs have achieved a higher plate life by controlling the force applied to them and giving them a more evenly distributed force.
NO COOLING MEDIUM REQUIRED	Once the operating temperatures have been established and the correct Nutberry Gas Springs installed, it is possible to operate the gate valve without the introduction of a cooling medium. Thus further reducing operating costs.
REDUCED OXYGEN/NITROGEN PICK UP	Being able to operate without a cooling medium assists the production of clean steel by providing an oxygen and nitrogen free atmosphere in the area of the refractory plate.
HIGHER SAFE OPERATING TEMPERATURE	Gas Springs operate at temperatures above those possible with coiled springs, keeping gate valve mechanisms safer should there be a temporary shortage of cooling medium.
GUARANTEED RELIABLITY	Nutberry Gas Springs are the only gas springs with a guarantee

The quality of Nutberry TDEs is such that although the Nutberry TDEs are designed and guaranteed to operate at temperatures upto 500°C, in many cases they have been used at temperatures in excess of this as can seen below.

Gas springs in situ

Nutberry TDEs in Flo-Con Mechanism

Gas springs in situ, another photo. This one shows the TDEs being used at well above 500 deg C

Nutberry TDEs Operating at Elevated Temperatures