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Product Specifications:
| Item | Pressure Control Valve |
| Actuation Mechanism | Pressure |
| Body | Brass |
| Body Material | Brass |
| Check Valve Cracking Pressure | 90 psi |
| Length | 3.66" |
| Max. Flow Rate | 4 GPM |
| Maximum Operating Temperature | 250°F |
| Maximum Pressure | 125 psi |
| Maximum Pressure Setting | 90 psi |
| Minimum Operating Temperature | -40°F |
| Minimum Pressure | 40 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 | 90 psi |
| Pressure Range (hydraulic Valves) | 40 psi to 135 psi |
| Pressure Range - Hydraulic Valves | 40 psi to 135 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) | 0.52 |
| Ship height (cm) | 3.18 |
| Ship length (cm) | 9.3 |
| Ship width (cm) | 9.3 |
| Country of Origin | US |
Product Variants
| Product | Model | Body Material | Valve Type | Max. Flow Rate | Pressure Range (hydraulic Valves) | Preset Pressure Settings | Valve Port Type | Seal Material | Valve Port Thread Type | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
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R4V065B110A1 | Cast Iron | Relief | - | 100 psi to 1532 psi | - | - | Nitrile | SAE | €2,624.41 | |
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R4V065B310A1 | Cast Iron | Relief | 53 GPM | 100 psi to 3045 psi | - | - | Nitrile | SAE | €2,624.41 | |
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R4V065B510A1 | Cast Iron | Relief | 53 GPM | 100 psi to 5075 psi | - | - | Nitrile | SAE | €2,624.41 | |
![]() |
647B-2-1/2-2 | Stainless Steel | Poppet | 10 GPM | 10 psi to 50 psi | 50 psi | NPT | - | - | €6,354.19 | |
![]() |
637B-2-1/2-2 | Brass | Soft Seat | 10 GPM | 10 psi to 50 psi | 35 psi | NPT | - | - | €1,300.26 | |
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647B-2-1/4-2 | Stainless Steel | Poppet | 4 GPM | 10 psi to 50 psi | 50 psi | NPT | - | - | €4,258.95 | |
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637B-2-1/4-2 | Brass | Soft Seat | 4 GPM | 10 psi to 50 psi | 35 psi | NPT | - | - | €1,171.05 |
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PARKER 637B-3-1/4-2 Pressure Control Valve, 40 To 135 Psi, 1/4 Inch Npt Port Size, 4 Gpm Max. Flow, Brass
€1,171.05 /unit


