Type DC Diaphragm

General Description

Type DC Diaphragm

This style diaphragm is similar in function to the Type FC diaphragm, while the sealing and hardware designs are the same as the Type D.

Dimensions and Tolerances

Type DC Dimensions and Tolerances

	Inches	mm	Inches	mm	Inches	mm	Inches	mm	Inches	mm
Cylinder Diameter	.37-.99	9-25	1.00-2.50	25-64	2.51-4.00	64-102	4.01-8.00	102-205	8.01 & up	205 & up
Height	See available sizes table
Cylinder Diameter	Tolerances on Cylinder Diameter and Piston Diameter are ± 0.010 per inch (0.254 mm) of diameter but the tolerance will be no less than ± 0.010 (0.254 mm) or greater than ± 0.060 (1.52 mm)
Piston Diameter
Head & Flange Thickness	.015 ± .003	0.38 ± 0.08	.017 ± .004	0.43 ± 0.10	.024 ± .004	0.61 ± 0.10	.035 ± .005	0.89 ± 0.13	.045 ± .007	1.14 ± 0.18
Wall Gauge	.015 ± .003	0.38 ± 0.08	0.17 ± .004	0.43 ± 0.08	.024 ± .004	0.61 ± 0.10	.035 ± .005	0.89 ± 0.13	.045 ± .007	1.14 ± 0.18
Flash Projection	.025 Max.	0.64 Max.	.025 Max.	0.64 Max.	.035 Max.	0.89 Max.	.040 Max.	1.02 Max.	.056 Max.	1.42 Max.
Flash Thickness	.025 Max.	0.64 Max.	.025 Max.	0.64 Max.	.035 Max.	0.89 Max.	.040 Max.	1.02 Max.	.056 Max.	1.42 Max.
Piston/Flange Radius	.031	.075 Max	.063	1.60 Max	.094	2.39	.125	3.18	.125	3.18
Flange Diameter	Cyl. Diam. + .313	Cyl. Diam. + 7.95	Cyl. Diam. + .500	Cyl. Diam. + .12.70	Cyl. Diam. + .750	Cyl. Diam. + 19.50	Cyl. Diam. + 1.000	Cyl. Diam. + 25.40	Cyl. Diam. + 1.000	Cyl. Diam. + 25.40
Bead Width	.094 ± .003	2.39 ± 0.08	.125 ± .003	3.18 ± 0.08	.187 ± .003	4.75 ± 0.08	.250 ± .003	6.35 ± 0.08	.250 ± .004	6.35 ± 0.10
Bead Height	.095 ± .004	2.41 ± 0.10	.135 ± .004	3.43 ± 0.10	.200 ± .005	5.08 ± 0.13	.270 ± .006	6.86 ± 0.15	.270 ± .008	6.86 ± 0.20

Diaphragm Flange Diameter and Hole Trim Tolerance
Diameter		Size		Position
(Inches)	(mm)	(Inches)	(mm)	(Inches)	(mm)
0-1.00	.0-25.40	± .010	0.25	.010	0.25
1.01-3.00	25.65-76.20	± .020	0.51	.020	0.51
over 3.01	over 76.45	± .030	0.76	.030	0.76

Angular Relationship of holes: ± 1/2 degree.

Hardware Recommendations

TYpe DC Hardware Recommendations

Cylinder Diameter		.25-.99	6-25	1.00-2.50	25-64	2.51-4.00	64-102	4.01-8.00	102-205	8.01 & up	205 & up
Groove Width		.109	2.77	.141	3.58	.219	5.56	.281	7.14	.281	7.14
± .003	0.08 ±
Groove Height		.076	1.93	.105	2.67	.160	4.06	.224	5.69	.224	5.69
± .002	0.05 ±
Flange & Piston Corner Radii		.031	0.79	.063	1.60	.094	2.39	.125	3.18	.125	3.18
Lip Width		.062	1.57	.125	3.18	.187	4.75	.250	6.35	.250	6.35
± .003	0.08 ±
Lip Clearance		.021	0.53	.021	0.53	.031	0.79	.036	0.91	.048	1.22
± .003	0.08 ±

Available Sizes

Dia•Com Part No.	Cylinder Diameter		Piston Diameter		Height		Gauge Approx.		Convolution Width		Effective Pressure Area		Maximum Half-Stroke
Dia•Com Part No.	(Inches)	(mm)	(Inches)	(mm)	(Inches)	(mm)	(Inches)	(mm)	(Inches)	(mm)	(Inches)	*	(Inches)	(mm)
DC-37-12	0.37	9	0.27	7	0.12	3	.017	0.43	.050	1.3	0.08	0.5	0.11	2.8
DC-62-10	0.62	16	0.50	13	0.10	3	.020	0.51	.060	1.5	0.25	1.6	0.07	1.8
DC-69-12	0.69	18	0.50	13	0.12	3	.017	0.43	.095	2.4	0.28	1.8	0.05	1.3
DC-91-15	0.91	23	0.72	18	0.15	4	.020	0.51	.095	2.4	0.52	3.4	0.01	0.3
DC-125-15	1.25	32	1.05	27	0.15	4	.017	0.43	.100	2.5	1.04	6.7	0.08	2.0
DC-150-15	1.50	38	1.31	33	0.15	4	.017	0.43	.095	2.4	1.55	10.0	0.08	2.0
DC-175-15	1.75	44	1.56	40	0.15	4	.017	0.43	.095	2.4	2.15	13.9	0.08	2.0
*Metric effective pressure area shown in square centimeters.

Dia•Com is a leading international provider of innovative, cost-effective molded diaphragm solutions critical to the operation of essential systems and equipment in industrial, automotive, aerospace, medical instrumentation, and food and water processing applications. The company's reputation for excellence is based on superior quality in the design, manufacture and application of its high-performance, state-of-the-art, fabric-reinforced and homogeneous elastomeric rubber seals. Our custom engineered solutions are found in many products today, including diaphragm pumps, rubber seals, pneumatic diaphragm pumps, high pressure diaphragm pumps, viton gaskets, diaphragm carburetor, diaphragm pressure gauges, diaphragm vacuum pumps, diaphragm air compressors, diaphgram fuel pumps and diaphragm metering pumps.