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HC SEAL

Air Free Sealing Technology

The MECO HC seal model is an air-free seal 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 stationary faces. The various seal assemblies are sized for equipment following standards of the Conveyor Equipment Manufacturers Association (C.E.M.A.) and metric equivalents

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 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

C.E.M.A Standard Sizes (millimeters)

CEMA 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	HBZ - Anodized Alum. Housing	HBP - FDA Nylon Housing	HBS - 316L Stainless Housing
	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)
MECO3000 (recommended)	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

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)

HC Seal

HC SEAL

Air Free Sealing Technology

What is MECO’s HC Seal Model?

When are HC Seals the Best Option?

How Does The HC Seal Model Work?

What Sizes Are Available?

What Construction Is Available?

HC Seal Sizing Chart

Stocked HSG#

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

C.E.M.A Standard Sizes (inches)

C.E.M.A Standard Sizes (millimeters)

Specifications

Results may vary with operating conditions and shaft ø - please call for discussion.

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