PN16
Description
The KA and KB range of two-port valves are used in conjunction with Spirax Sarco SA control systems to provide a self-acting temperature control unit.
Available Types
| Model | Description |
|---|---|
| KA31 | Normally open with screwed connections |
| KA33 | Normally open with flanged connections |
| KB31 | Normally open with phosphor bronze balancing bellows and screwed connections |
| KB33 | Normally open with phosphor bronze balancing bellows and flanged connections |
| KC31 | Normally open with stainless steel balancing bellows and screwed connections |
Note: Pressure balancing bellows enables the valve to operate against higher differential pressures.
Standards and Certification
- Standards: These products fully comply with the requirements of the European Pressure Equipment Directive 2014/68/EU
- Certification: As standard these products are available with a manufacturers' Typical Test Report
- Note: All certification/inspection requirements must be stated at the time of order placement.
Sizes and Pipe Connections
Screwed Connections
- BSP T Rp (ISO 7-1) (BSP parallel) or NPT:
- KA31: ½", ¾", 1", 1¼", 1½" and 2"
- KB31: 1", 1¼", 1½" and 2"
- KC31: 1½" and 2"
Flanged Connections
- EN 1092 PN16 and BS 10 Table F:
- KA33: DN15, DN20, DN25, DN32, DN40 and DN50
- KB33: DN25, DN32, DN40 and DN50
Pressure/Temperature Limits
| Parameter | Value |
|---|---|
| Body design conditions | PN16 |
| Maximum design pressure | 16 bar g @ 120°C |
| Maximum design temperature | 220°C @ 13.8 bar g |
| Minimum design temperature | -10°C |
| Maximum operating temperature | 220°C |
| Minimum operating temperature | 0°C |
Note: For lower operating temperatures consult Spirax Sarco.
Maximum Differential Pressure (bar):
| Model/Size | DN15 | DN20 | DN25 | DN32 | DN40 | DN50 |
|---|---|---|---|---|---|---|
| KA31 | 13.0 | 10.3 | 4.5 | 3.0 | 2.0 | 1.5 |
| KA33 | 13.0 | 10.3 | 4.5 | 3.0 | 2.0 | 1.5 |
| KB31 | - | - | 10.3 | 9.0 | 8.2 | 6.9 |
| KB33 | - | - | 10.3 | 9.0 | 8.2 | 6.9 |
| KC31 | - | - | - | - | 13.0 | 13.0 |
Designed for a maximum cold hydraulic test pressure of: 24 bar g
Important
The product must not be used in the shaded region of the chart.
Kv Values
| Size | DN15 | DN20 | DN25 | DN32 | DN40 | DN50 |
|---|---|---|---|---|---|---|
| KA31, KA33 | 2.90 | 4.64 | 9.80 | 16.48 | 23.70 | 34.00 |
| KB31, KB33 | - | - | 9.80 | 16.48 | 23.70 | 34.00 |
| KC31 | - | - | - | - | 16.48 | 34.00 |
Conversion formulas: Cv (UK) = Kv × 0.963 | Cv (US) = Kv × 1.156
Capacities
- For saturated steam sizing capacities see TI-GCM-08
- For water valve sizing capacities see TI-GCM-09
Materials
| No. | Part | Material | Standard |
|---|---|---|---|
| 1 | Body | Cast iron | DIN 1691 GG 25 |
| 2 | Bonnet | Cast iron | DIN 1691 GG 25 |
| 3 | Valve head | Stainless steel | BS 970 431 S 29 |
| 4 | Valve seat ring | Stainless steel | BS 970 431 S 29 |
| 5 | Valve seat gasket (DN15-DN25) | Mild steel | BS 1449 CS 4 |
| 5 | Valve seat gasket (DN32-DN50) | Reinforced exfoliated graphite | - |
| 6 | Return spring | Stainless steel | BS 2056 302 S 26 |
| 7 | Stem (KA and KB) | Brass | BS 2874 CZ 121 |
| 7 | Stem (KC) | Stainless steel | BS 970 321 S 20 |
| 8 | Bonnet gasket | Reinforced exfoliated graphite | - |
| 12 | Bonnet studs | Steel | BS 4439 Gr. 8.8 |
| 13 | Bonnet nuts | Steel | BS 3692 Gr. 8 |
| 13 | Bellows (KB) | Phosphor bronze | EN 12449 Cu Sn 6 |
| 13 | Bellows (KC) | Stainless steel | AISI 316L |
| 14 | Bellows gasket | Reinforced exfoliated graphite | - |
| 15 | Bonnet bush | Brass | BS 2874 CZ 121 |
| 16 | Plunger | Brass | BS 2874 CZ 121 |
Dimensions and Weights (Approximate) in mm and kg
KA31 and KA33
| Size | A (Screwed) | A1 (PN16) | A1 (BS10 F) | B | C | Weight (Screwed) | Weight (Flanged) |
|---|---|---|---|---|---|---|---|
| DN15- ¾" | 90 | 130 | 130 | 105 | 37 | 1.3 | 3.3 |
| DN20- ¾" | 104 | 150 | 147 | 105 | 37 | 1.6 | 4.3 |
| DN25- 1" | 136 | 160 | 157 | 107 | 51 | 3.2 | 5.7 |
| DN32- 1¼" | 144 | 180 | 180 | 110 | - | 5.1 | 8.8 |
| DN40- 1½" | 150 | 200 | 200 | 110 | - | 6.3 | 11.0 |
| DN50- 2" | 180 | 230 | 230 | 110 | - | 7.8 | 13.0 |
KB31, KB33 and KC31
| Size | A (Screwed) | A1 (PN16) | A1 (BS10 F) | B | C | Weight (Screwed) | Weight (Flanged) |
|---|---|---|---|---|---|---|---|
| DN25- 1" | 136 | 160 | 157 | 138 | 51 | 3.4 | 5.9 |
| DN32- 1¼" | 144 | 180 | 180 | 152 | 51 | 5.7 | 9.1 |
| DN40- 1½" | 150 | 200 | 200 | 152 | 62 | 6.9 | 11.2 |
| DN50- 2" | 180 | 230 | 230 | 152 | 71 | 8.8 | 13.4 |
Spare Parts
The spare parts available are shown in solid outline. Parts drawn in a grey line are not supplied as spares.
KA31 and KA33 Available Spares
| Spare Part | Consists of |
|---|---|
| Valve seat assembly | A, D, E, L |
| Set of all gaskets | E, L |
| Set of bonnet studs and nuts (set of 4) | S |
KB31, KB33 and KC31 Available Spares
| Spare Part | Consists of |
|---|---|
| Valve seat assembly (excluding bellows and stem assembly) | A, B, C, D, E, L, U, G |
| Bellows and stem assembly | G, L, N, H |
| Set of all gaskets | B, C, E, L, U, G |
| Set of bonnet studs and nuts (set of 4) | S |
How to order spares: Always order spares by using the description given in the column headed 'Available spares' and state the size and type of valve. Example: 1 - Valve seat assembly for a Spirax Sarco DN32 KB31 self-acting control valve.
Safety Information, Installation and Maintenance
For full details see the Installation and Maintenance Instructions (IM-S21-01) supplied with the product.
Installation note: The valve should be fitted in a horizontal line with the actuator vertically below the pipeline.
How to Order
Example: 1 off Spirax Sarco 1¼" screwed BSP KB33 self-acting control valve with cast iron body and phosphor bronze bellows.
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