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Product Specifications:
| Item | Pressure Control Valve |
| Actuation Mechanism | Pressure |
| Body | Brass |
| Body Material | Brass |
| Check Valve Cracking Pressure | 550 psi |
| Length | 3.66" |
| Max. Flow Rate | 4 GPM |
| Max. Operating Temp. | 250°F |
| Max. Pressure | 650 psi |
| Max. Pressure Setting | 550 psi |
| Min. Operating Temp. | -40°F |
| Min. Pressure | 430 psi |
| Overall Height | 3.66" |
| Overall Length | 1.685" |
| Overall Width | 1 1/4" |
| Port Connection Size | 1/4" |
| Port Connection Type | NPT |
| Port Connections | Inlet, Outlet |
| Preset Pressure Settings | 550 psi |
| Pressure Range (hydraulic Valves) | 430 psi to 650 psi |
| Series | 620-649 Series |
| Valve Control | Pressure Relief |
| Valve Port Type | NPT |
| Valve Type | Soft Seat |
| Width | 1 1/4" |
Shipping Info:
| Ship weight (kg) | 0.38 |
| Ship height (cm) | 3.18 |
| Ship length (cm) | 9.3 |
| Ship width (cm) | 9.3 |
| Country of Origin | US |
Product Variants
| Product | Model | Max. Flow Rate | Overall Width | Pressure Range (hydraulic Valves) | Valve Type | Max. Pressure | Min. Pressure | Max. Operating Temp. | Min. Operating Temp. | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
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R4V065B110A1 | - | - | 100 psi to 1532 psi | Relief | - | - | - | - | €2,927.55 | |
![]() |
R4V065B310A1 | 53 GPM | 3 11/25" | 100 psi to 3045 psi | Relief | 3045 psi | 100 psi | 176°F | -4°F | €2,927.55 | |
![]() |
R4V065B510A1 | 53 GPM | 3 11/25" | 100 psi to 5075 psi | Relief | 5075 psi | 100 psi | 176°F | -4°F | €2,927.55 | |
![]() |
647B-2-1/2-2 | 10 GPM | 1 3/4" | 10 psi to 50 psi | Poppet | 50 psi | 10 psi | 250°F | -40°F | €7,088.19 | |
![]() |
637B-2-1/2-2 | 10 GPM | 1 3/4" | 10 psi to 50 psi | Soft Seat | 50 psi | 10 psi | 250°F | -40°F | €1,470.54 | |
![]() |
647B-2-1/4-2 | 4 GPM | 1 1/4" | 10 psi to 50 psi | Poppet | 50 psi | 10 psi | 250°F | -40°F | €4,258.95 | |
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637B-2-1/4-2 | 4 GPM | 1 1/4" | 10 psi to 50 psi | Soft Seat | 50 psi | 10 psi | 250°F | -40°F | €1,324.42 |
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PARKER 637B-6-1/4-2 Pressure Control Valve, 430 To 650 Psi, 1/4 Inch Npt Port Size, 4 Gpm Max. Flow, Brass
€1,251.40 /unit


