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HC Seal

Air Free Sealing Technology

 

 

 What is MECO’s HC Seal Model?

The MECO HC seal model is the best air-free choice in sealing technology for screw conveyors . The HC model is a full-contact, soft-face mechanical shaft seal, using an elastomer drive to rotate bearing-grade, polymeric seal faces against fixed, stainless steel seal faces. The various seal assemblies are sized for equipment following standards of the Conveyor Equipment Manufacturers Association (C.E.M.A.) and their metric equivalents.
The HC Seal model provides the superior performance, durability and quality of workmanship that are hallmarks of MECO’s many other highly-regarded custom seals. MECO’s first-rate customer service is provided for each HC seal sold.

 When are HC Seals the Best Option? 

The MECO HC Seal model is ideal for screw conveyors/scrolls, small blenders, bucket elevators, and similar rotating equipment used in bulk process industries. The HC Seal model is used on horizontal, inclined and vertical shafts for unsplit installations.

 How Does the HC Seal Model Work

The HC Seal replaces standard waste pack housings. It is made with a heavy, metal or FDA nylon housing that cannot be crushed by an over-tightened flange bearing. Two replaceable stainless steel stationary seal faces attach to the seal housing. Inside is a rotating seal face assembly, consisting of replaceable rotors and drive elastomer. The elastomer and rotors interlock, forming an air and watertight seal. The low-friction rotating seal faces are at right angles to the shaft and in full contact with the stationary seal faces.

Around the driving elastomer is a stainless steel hose clamp to provide seal face loading. The seal is vented to atmosphere at an effective location to monitor seal performance.

 What sizes are available? 

The HC model seal is stocked in 6 standard inch and 10 metric sizes. These 16 seals can be easily converted for other shaft sizes and all fit within the 6 stocked housing (HSG) sizes.  This allows the HC model seals to be sized for shaft diameters 5.07” (129mm) and smaller. See the Stocked HSG# Chart below for maximum shaft size for each of the six housings.

 What construction is available?

The HC seal’s rugged housing options are designed for long life. You may choose from three stock housing materials: FDA Nylon, Anodized Aluminum or 316L SS. Three elastomer materials, Viton, FDA white silicone or EPDM, ensure compatibility with nearly all applications. The standard stators are type 304 stainless steel. The standard rotors are MECO3000, a high-performance, bearing grade, polymer- filled PTFE with FDA approval. No abrasive filler material is added to MECO3000.
MECO3120, a white, FDA approved, ceramic filled, PTFE is available as an option for processes where maximum wear resistance is needed.
Any of the components may be individually replaced. Unsplit rebuild kits consisting of replacement rotors and drive elastomer are maintained in-stock for immediate shipment. In cases where it is difficult to remove the bearing or drive, convenient, fully-split rebuild kits are available.
Since Woodex’s MECO Seal division manufactures many custom shaft seals, we have the capability to fabricate from any material when required. See Sizing Chart below for dimensional information.

 

 

 

HC Seal Sizing Chart

Stocked HSG#

Each MECO HC Seal housing can accommodate ­optional shafts up to these limits:

HSG #
Max. Shaft ø
1
1.77"/45mm
2.24"/57mm 
3
2.63"/67mm
4
3.62"/92mm
5
4.07"/103mm
6
5.07"/129mm

 

C.E.M.A Standard Sizes (inches)

CEMA Part #

øA shaft 

P

HSG # 

SQ MIN 

SQ MAX 

øC MIN

øC MAX

HCZ1W4A150

1.50

5.38

1

4.00

4.38

5/8 

5.65 

6.19 

HCZ2W4A200

2.00

6.50

4.38 

5.38 

3/4 

6.19 

7.60

HCZ3W4A244

2.44 

7.38

3

5.13 

6.25 

3/4

7.25

8.84

HCZ4W4A300

3.00

7.75 

4

5.75

6.50 

7/8

8.12 

9.19 

HCZ5W4A344

3.44

9.25 

5

6.75

8.00

7/8

9.55 

11.31 

HCZ6W4A444

4.44

10.88

7.75 

8.75 

7/8 

10.96

12.38 

  

METRIC Standard Sizes (millimeters)

Metric Part #

øA shaft

P

HSG # 

SQ MIN

SQ MAX

øC MIN 

øC MAX

HCZ1W4A157/177

40/45

137 

1

102 

111

16 

144

157

HCZ2W4A197/217

50/55

165

2

111 

137 

19 

157 

193

HCZ3W4A236/256

60/65 

187

3

130 

159 

19 

184 

225

HCZ4W4A276

70

197

4

146

165 

22 

206 

233

HCZ4W4A295

75 

197

4

146 

165 

22

206 

233

HCZ4W4A315

80

197 

4

146 

165

22

206 

233 

HCZ5W4A335

85

235

5

171 

203

22

243 

287 

HCZ5W4A354

90 

235 

5

171 

203 

22

243 

287 

HCZ6W4A394

100 

276

6

197 

222 

24

278 

314

HCZ6W4A433

110

276

6

197

222 

24

278 

314

 

Specifications

 

Rotor Material 

Process Conditions

HCZ - Anodized Alum. Housing

HCP - FDA Nylon Housing 

HCS - 316L Stainless Housing 

MECO3000

(recommended)

TEMPERATURE
-60 to 500°F (-50 to 260°C)
-35 to 200°F (-37 to 94°C)
-60 to 500°F (-50 to 260°C)
PRESSURE
Vacuum to 10 psig (70 kPa)
Vacuum to 10 psig (70 kPa)
Vacuum to 10 psig (70 kPa)
SPEED
to 150 RPM
to 100 RPM
to 150 RPM

UHMW 

TEMPERATURE
-178 to 135°F (-117 to 57°C)
-35 to 135°F (-37 to 57°C)
-178 to 135°F (-117 to 57°C)
PRESSURE
Vacuum to 5 psig (35 kPa)
Vacuum to 5 psig (35 kPa)
Vacuum to 5 psig (35 kPa)
SPEED
to 50 RPM
to 50 RPM
to 50 RPM
Results may vary with operating conditions and shaft ø - please call for discussion.

 

Mechanical Capabilities: 1/64" Axial Motion
Silicone Elastomer -178 to 500°F (-117 to 260° C) 
                               1/4" T.I.R. Runout 
Viton Elastomer -75 to 450°F (-59 to 232° C) 
                               1/2" Thermal Growth 
EPDM Elastomer -70 to 325°F (-56 o 163°C) 
Results may vary with operating conditions and shaft ø - please call for discussion.

Literature

HC Seal

The MECO TT