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 |
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 |
W |
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 |
2 |
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 |
6 |
7.75 |
8.75 |
7/8 |
10.96 |
12.38 |
METRIC Standard Sizes (millimeters) |
||||||||
|
Metric Part # |
øA shaft |
P |
HSG # |
SQ MIN |
SQ MAX |
W |
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 |
