Explosion-proof cable glands KOVTN for non-armored cable in hoses, conduits, metal hoses are used in areas, where explosion-proof sealing on the cable sheath is required, they protect the cable against accidental pulling out. The distinct feature of explosion-proof cable glands KNVTV is the inner thread for external connection, which helps to connect flexible hoses, conduits, corrugated metal hoses, etc.
The most important development is the use of one sealing ring for the whole range of diameters of crimped cable, which reliably crimps the incoming cable and ensures Exd type of protection. One sealing ring together with mandrel or cable withstand the force in newtons, which is equal to the twentyfold diameter value (in mm) of the mandrel or the cable. This helps to use KOVTN series explosion-proof cable glands without additional unloading of cable.
Increased wall thickness of bodies of GORELTEX cable glands considerably enhances their strength compared with cable glands of other manufacturers.
Combined single orientation clamping system of the armor and sealing of cable inner sheath are used in KOVTN series cable glands. Such combined system helps to avoid phase-to-phase voltage/ linear shift between inner sheath and armor/braid of the cable during mounting of cable gland. Mounting of KOVTN series cable gland is more convenient and error-free: presence of a combined fastening element does not require constant balancing between fastening clamp of the armor and that of the cable inner sheath. This guarantees high-quality sealing of the cable inner sheath and reliable galvanic coupling between cable gland body and cable armor. Dimensions of cable glands are significantly reduced which helps to save space and reduce the weight of the explosion-proof device.
Clamping ring of the armor helps to use KOVTN cable gland for all types of cable armor/braid: single-wire armor, with braid, tape armor, wire armor. Clamping ring of the armor helps to crimp armor/braid with the thickness from 0 to 3.5 mm (KOVTN01-...-KOVTN5 from 0 to 2.5 mm, starting from KOVTN6 from 0 to 3.5 mm). External sealing ring for ingress protection prevents ingress of water into cable gland, which can cause damage to armor/braid.
KOVTN explosion-proof cable glands ensure earthing circuit continuity between cable armor/braid and cable gland body by means of clamping ring of the armor/braid that ensures protection against electromagnetic disturbances. PG-GERMETIC waterproof insulation is used for protection in case of continuous flooding of cable armor/braid. Cable glands conform to DTS01 requirements.
KOVTN cable glands may be used for direct insertion as a part of fireproof enclosures of IIA, IIB+H2, IIC subgroups, which have the volume exceeding 2000 cm3.
KOVTV explosion-proof cable glands are completely suitable for use with equipment having ExnR marking.
Thanks to their design, KOVTN explosion-proof cable glands ensure cable unloading. These cable glands ensure protection against pulling out without causing damage to the structure of cable sheath and conductors, as well as prevent cable overcompression.
When choosing KOVTN series cable gland, it is necessary to consider that dimension type of thread at the outlet is larger than at the connecting part.
Explosion-proof cable glands of KOVTN series are designed in Russia (Patent No. 155936, rightholder "ZAVOD GORELTEX" Co. Ltd. (former "CORTEM-GORELTEX" Co. Ltd.), operating characteristics of which significantly surpass Russian and foreign analogues.
Scope of application – outdoor and indoor hazardous areas as per explosion protection marking, GOST 30852.13-2002 (IEC 60079-14:1996), dangerous production facilities of I, II, III, IV hazard class supervised by Rostechnadzor of the RF and national technical supervision bodies of the Customs Union and CIS countries.
|Cable gland dimension type||Thread||Dimensions, mm||Diameter of crimped cable, mm||Mass, kg||
||ØM||C||Inner Ød||Outer ØD|
|Cable gland dimension type||Thread||Dimensions, mm||Diameter of crimped cable, mm||Mass, kg|
||ØM||C||Inner Ød||Outer ØD|
|KOVTN4N5G||FETAM4N5C||1 1/4"||1 1/2"||65||144||25-31||27-37||1|
|KOVTN4N5G.../P||FETAM4N5C.../R||1 1/4"||1 1/2"||65||144||18-31||24-37||1|
|RKV type||НаименовName of metal hose||Inside diameter of metal hose, mm||Diameter of KOVTN external connection thread, G cylindrical pipe thread GOST 6357-81|
|RKV32||RZ-TSKH-32, MRPI-32||32||1 1/4"|
|RKV38+АВ-5GН-4GВ||RZ-TSKH-38, MRPI-38||38||1 1/4"|
|RKV38||RZ-TSKH-38, MRPI-38||38||1 1/2"|
|RKV50+АВ-6GН-5GВ||RZ-TSKH-50, MRPI-50||50||1 1/2"|
* In order to connect the metal hoses with different combination of inside diameter and diameter of crimped cable, it is required to use other size of AV adapter.
|KOVTN||X||Х||Х||Х||Х||/||Х||– TU 3400-007-72453807-07|
|Cable gland type|
|Thread type: Taper inch NPT - N; Metric GOST 24705 - M; Taper pipe GOST 6211-81 - R; Pipe cylindrical GOST 6357-81 - G|
|Dimension type for thread for external connection|
|Type of thread for thread for external connection*: Taper inch NPT - N; Metric GOST 24705 - M;
Taper pipe GOST 6211-81 - R; Pipe cylindrical GOST 6357-81 - G
|Material of cable gland: Nickel-plated brass - NK, Stainless steel - N|
|Options, accessories and versions|