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Diaphragm Hardware

Piston and Standard Convolution Width Dimensions

Piston and Standard Convolution Width Dimensions

 

Diaphragm Cylinder
Diameter
(
Inches)
Diaphragm Cylinder
Diameter
(
mm)
Piston Skirt Length Piston Radius
(Inches)
Piston Radius
(
mm)
Standard
Convolution Width
(
Inches)
Standard
Convolution Width
(
mm)

.37 to .99


9 to 25

Height + Half-Stroke
2

.0312


.080


.0625


1.59


1.00 to 2.50


25 to 64

Height + Half-Stroke
2

.0625


1.59


.0937


2.38


2.51 to 4.00


64 to 102

Height + Half-Stroke
2

.0937


2.38


.1562


3.97


4.01 to 8.00


102 to 205

Height + Half-Stroke
2

.1280


3.18


.2500


6.35

 

Piston Cap Dimensions

Piston Cap Dimensions Figure 1 Piston Cap Dimensions Figure 2
Diaphragm Cylinder
Diameter
(
Inches)
Diaphragm Cylinder
Diameter
(
mm)
1

2
(Inches)
2
(
mm)
3
(
Inches)
3
(
mm)
4
(
Inches)
4
(
mm)
5
(
Inches)
5
(
mm)
6
(
Inches)
6
(
mm)

.37 to .99


9 to 25


Piston + 2
(Diaphragm Thickness)


Not
Required


1.59


Not
Required


.008


Not
Required


0.20


Not
Required


.125


.0625


3.18


1.00 to 2.50


25 to 64


Piston + 2
(Diaphragm Thickness)


.15 x Piston Thickness


3.81 x Piston Thickness


.010


0.250


.094


2.39


.012


0.310


.1870


4.75


2.51 to 4.00


64 to 102


Piston + 2
(Diaphragm Thickness)


.15 x Piston Thickness


3.81 x Piston Thickness


.015


0.380


.109


2.78


.015


0.380


.2180


5.54


4.01 to 8.000


102 to 205


Piston + 2
(Diaphragm Thickness)


.15 x Piston Thickness


3.81 x Piston Thickness


.015


0.380


.125


3.18


.015


0.380


.2500


6.35

 

Bonnet Dimensions

Bonnet Dimensions Figure 1 Bonnet Dimensions Figure 2

 

Maximum Diameter
Length
Maximum Radius

Piston Diameter + 4
(Diaphragm Gauge)


Diaphragm
Upstroke

Convolution Width
2

 

Cylinder Dimensions

Diaphragm Cylinder
Diameter
(
Inches)
Diaphragm Cylinder
Diameter
(
mm)
Length Radius
(Inches)
Radius
(
mm)

.25 to .99


6 to 25


Downstroke +
Piston Skirt


.031


.079


1.00 to 2.50


25 to 64


Downstroke +
Piston Skirt


.063


1.600


2.51 to 4.00


64 to 102


Downstroke +
Piston Skirt


.094


2.390


4.01 and up


102 and up


Downstroke +
Piston Skirt


.125


3.180

 

Flange Retention Methods for Type F and FC Diaphragms

Swaged Lip—Lending itself to high volume/low cost, the swaged lip resembles the crimp ring in design except that the lip is an integral part of the cylinder or bonnet. Lip should be flexible and thin to insure proper flange retention.

Swaged Lip


Crimped Ring—This method lends itself to high volume and low cost manufacture. It utilizes a separate metal crimp ring and is assembled to the unit with special crimping tools. These crimp rings are made of thin, ductile materials so that the force required to form the lip will not overcompress the diaphragm flange area.

 

Type F Diaphragm | Type FC Diaphragm
Crimped Ring

 

Flange Retention Methods for Type D and DC Diaphragms

Pivoted Rocking Bracket—This method provides quick assembly and disassembly. The pivoted rocking bracket is attached to the housing flange, and the central jam screw secures the bonnet against the mating flange.

Pivoted Rocking Bracket


Ring Clamp—“V” style clamp rings can be disassembled quickly by removing a clamp lever. A retainer plate is removed by turning it 90 degrees where two “wings” and a retaining screw drop into a keyhole.

Ring Clamp


Beveled Edge Retainer PlateEliminates the need for flange bolts as a beveled edge ring is snapped into a groove in the extension of the cylinder housing flange. This loads the bonnet assembly onto the mating bead, generally producing low clamping forces.

 

 

Type D Diaphragm | Type DC Diaphragm
Beveled Edge Retainer Plate

 

Flange Retention Methods for Type O and OA Diaphragms

Crimped RingUsed in high volume, low cost applications, this method eliminates typical flange construction and flange bolts.

Crimped Ring


Bezel RingThis common method provides minimum clearance of the housing outside diameter. Male threads are machined on the cast bonnet to utilize drawn sheet metal cylinder housings, reducing costs.

Bezel Ring


Grooved BonnetThis method requires a sufficient number of circumferential clamp bolts so distortion does not occur between flange bolts. It is advisable to make provisions for the bead groove in the cast or molded bonnet.

 

Type O & OA Diaphragm
Grooved Bonnet

 

 

 

Related Diaphragm Products:

  • diaphragm pressure gauge
  • diaphragm vacuum pump
  • diaphragm air compressor
  • diaphgram fuel pump
  • diaphragm metering pump

 

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.

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